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a triangle geometry... July 18th 2010, 10:44 PM #1 Member Joined Feb 2010 From in the 4th dimension.... Posts 122 Thanks 9 a triangle geometry... let in triangle ABC,AB=AC. D is the midpoint of BC.E is the foot of the perpendicular from D to AB,and F is the midpoint of DE. Prove that AF is pe...
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A Kinetic Model for the Spread of Rumor in Emergencies Discrete Dynamics in Nature and Society Volume 2013 (2013), Article ID 605854, 8 pages http://dx.doi.org/10.1155/2013/605854 Research Article A Kinetic Model for the Spread of Rumor in Emergencies ^1Antai College of Economics and Management, Shanghai Jiao Tong U...
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app-b8 LIQUID HYDROGEN AS A PROPULSION FUEL,1945-1959 Appendix B - Propulsion primer, performance, parameters and units. Rocket Performance Parameters and Units [281] American ...
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Evaluate the sum using the well known rule: loga + logb = log(ab) we get: $[log_21]+[log_22]+[log_23]+...+[log_22002] = log_21*2*3*...*2001*2002 = log_22002!$ Stirling's approximation says that, for large n: $n! \approx \sqrt{2 \pi n} \frac{n^n}{e^n}$ So $ln(n!) \approx \frac{1}{2}ln(n) + n~ln(n) - n$ (ignoring the re...
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roof that the square root of 2 is irrational A proof that the square root of 2 is irrational How do we know that square root of 2 is an irrational number? In other words, how do we know that √2 wouldn't have a pattern in the decimal sequence? Maybe the pattern is very well hidden and is really long, billions of digits...
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Double Integrals Evaluate $\int\int_Re^{\frac{x-y}{x+y}}$ where $R=\{(x,y)\in\mathbb{R}^2:0\leq x,0\leq y,x+y=1\}$ using $x-y=u,x+y=v$. I got $\frac{1}{2}\int_0^2\int_u^1e^{\frac{u}{v}}dvdu$ but maple says im wrong. yes really On the bottom of the triangle $y=0$ and $x=0..1$ using this we get in the u-v plance $u=x-y ...
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Find the coeficient February 16th 2009, 11:09 PM #1 Senior Member Joined Jan 2009 Posts 381 Find the coeficient Find the coefficient of the terms in x as indicated , in the following expansions . (a) $(1+x)^2(2-3x)^7$ , term in x^3 (b) $(x+\frac{1}{x})^2(1-x)^5$ , term in x^2 . Thanks . ...
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Homework Help Posted by pitigoiu on Tuesday, April 2, 2013 at 3:35pm. A rectangular room has an area of 120ft squared. Marge drew a scale drawing of the pool using the scale 1.5cm=2ft. What was the area of the scale drawing? a) 213.3cm2 b) 67.5cm2 c)53.3cm2 d)1.5cm2 I don't think any of the choices match the answ...
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First and Second Partials at the Origin May 3rd 2010, 11:33 PM #1 Junior Member Joined Jan 2010 Posts 62 First and Second Partials at the Origin $f(x,y)=\sqrt[5]{x^5+y^5}$ The question is to find $f_x(0,0)$ and $f_{xx}(0,0)$ Solving $f_x(0,0)$ how I would normally take a partial derivative I ge...
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Multiplying/dividing with exponents June 9th 2009, 05:34 PM allyourbass2212 Multiplying/dividing with exponents I am having difficulties figuring out what exactly the author of my Algebra book is doing in regards to step 2. Expression $(\frac{x^3}{y^2}^5) (\frac{x}{y})^{-2}$ Step 1= $\frac{x^{15}}{...
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Fluctuation of Firm Size in the Long-Run and Bimodal Distribution Advances in Operations Research Volume 2011 (2011), Article ID 269239, 21 pages http://dx.doi.org/10.1155/2011/269239 Research Article Fluctuation of Firm Size in the Long-Run and Bimodal Distribution ^1Graduate School of Science, Kyoto University, Yo...
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Calculus Power Series My question looks like this: f(x)= 5/ (1-5x)^2 Find C0= c1= C2= C3= C4= Any help is much appreciated. If $- 1 < \xi < 1$ then $\frac{1}{1-\xi } = \sum_{n=0}^{\infty} \xi^n$. Term-by-term differenciation implies, $\frac{1}{(1-\xi)^2} = \sum_{n=0}^{\infty}(n+1)\xi ^n$. Thus if $-1 < 5x < 1 \implies...
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Linear Approximation problems..... October 26th 2008, 06:57 PM #1 Newbie Joined Sep 2008 Posts 24 Linear Approximation problems..... 1. Let $f(t)$ be the weight (in grams) of a solid sitting in a beaker of water. Suppose that the solid dissolves in such a way that the rate of change (in grams/minute) of ...
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Integration/ Completing the square... May 30th 2007, 12:10 PM #1 Integration/ Completing the square... Hi guys sorry I haven't been online much I've been very busy with SS1... Quick Question: If I am completing the square and I get the point where I am about the square both sides, but the side on the ri...
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Institute of Industrial Relations About WTS Prof. Clair Brown Faculty, Students and Affiliates Research Areas Online Research Reports Working Papers THE COMPETITIVE SEMICONDUCTOR MANUFACTURING HUMAN RESOURCES PROJECT: Second Interim Report CSM-32 Clair Brown, Editor 12.3 A Model of Learning by Doing The lea...
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An Exploration of the Range of Noise Intensity That Affects the Membrane Potential of Neurons Abstract and Applied Analysis Volume 2014 (2014), Article ID 801642, 11 pages http://dx.doi.org/10.1155/2014/801642 Research Article An Exploration of the Range of Noise Intensity That Affects the Membrane Potential of Neuro...
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Solution to y'' = -W*W*y - Bcos(W*t) ? July 8th 2007, 09:04 PM #1 Newbie Joined Jul 2007 Posts 6 Solution to y'' = -W*W*y - Bcos(W*t) ? Does anybody know the solution to y'' = -W*W*y - B cos(W*t) where W and B are constants and t is time. y'' is second order derivative of y with respect t...
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Homework Help Posted by lindsay on Friday, May 4, 2012 at 4:30am. I need help in understanding how to identify which identity to use. using this question as an example. Show that tan theta (sin theta+cot theta cos theata)all over cos theta = sec^2 theta. Please explain. • trigonometry - Steve, Friday, May 4, 2012 ...
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solve for interest rate August 28th 2008, 01:25 PM slym34 solve for interest rate Trying to figure out, without the use of an excel function how to solve for an interest rate of a mortgage knowing the following paramaters. initial principal balance - 200,000 total interest paid - 279,017.80 years a...
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Continuity of functions - Real Analysis October 13th 2008, 06:31 AM #1 Junior Member Joined Sep 2008 Posts 26 Continuity of functions - Real Analysis I have a homework assignement due tomorrow morning and I have some idea on how to do this problem but I am not very sure. Define functions f and g on ...
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Proving n^1/n tends to 1 November 6th 2012, 02:57 AM alexandria21 Proving n^1/n tends to 1 I need to prove that n^1/n tends to 1 as n tends to infinity. I have a hint that says write n^1/n=1+h and use Binomial Theorem Im just not sure where to start. Any ideas? November 6th 2012, 03:43 AM hedi Re:...
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Practically Efficient Blind Speech Separation Using Frequency Band Selection Based on Magnitude Squared Coherence and a Small Dodecahedral Microphone Array Journal of Electrical and Computer Engineering Volume 2012 (2012), Article ID 324398, 11 pages http://dx.doi.org/10.1155/2012/324398 Research Article Practically ...
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Generalizing the Multimodal Method for the Levitating Drop Dynamics ISRN Mathematical Physics Volume 2012 (2012), Article ID 869070, 19 pages http://dx.doi.org/10.5402/2012/869070 Research Article Generalizing the Multimodal Method for the Levitating Drop Dynamics ^1Institute of Mathematics, National Academy of Scie...
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Help with integration problem September 10th 2008, 06:21 AM Matt164 Help with integration problem This problem has been worked out for me, but I am confused about what exactly is going on in it. Problem: Find the indefinite integral. ∫-1/sqrt(1-(2t-1)^2) dt Step 1: Let u= 2t -1 Step 2: du= 2 d...
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Given that 907 and 997 are primes, use the fact that 907 equiv -997 (mod 28) to calcu June 7th 2012, 07:31 AM #1 Junior Member Joined Mar 2011 Posts 72 Given that 907 and 997 are primes, use the fact that 907 equiv -997 (mod 28) to calcu Given that $907$ and $997$ are primes, use the fact that $907 \equi...
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Q Field Questions July 7th 2010, 05:19 AM #1 Member Joined Jun 2010 From United States Posts 200 Q Field Questions Hello everybody, I reached this long section in my book about Q Fields, and after reading through this section, a couple of the examples have me feeling less than enlightened. Here ...
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Series problem with limiting sum June 8th 2007, 01:44 AM #1 Series problem with limiting sum A limit problem i have tried for hours now and just cannot wrap my head around Solution is apparently (1 + x)/(1 - x)^2 any help greatly appreciated, thanks jacs We are adding all of these together. ...
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Homework Help Posted by Andy on Wednesday, April 14, 2010 at 2:39pm. A.An observer moving at a speed of 0.810 c relative to a rod measures its length to be 2.00 m and sees its length to be oriented at 30.0 degrees with respect to the direction of motion. What is the proper length of the rod? B.What is the orientation...
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rolle's theorem for g(x)=x^3 + 3x^2 -2, show that there must ne one real root on [0,2] someone how do you use rolles theorem to do this one lol It's a useless detour (at least how I did it is), but since you want it so badly: Let $g_c(x)= \frac{x^4}{4} + x^3 -2x +c=4x(x^3+4x^2-2)+c$ Let $h(x)=x^3+4x^2-2$ then $h(0)<0...
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Parametric Vector and Scalar equations February 11th 2013, 06:29 PM olliethechum Parametric Vector and Scalar equations Ive been stuck on this problem for a while now, Consider the two lines in the xy-plane, given the equations: L[1]:ax+by=k L[2]:cx+dy=l where all four a,b,c and d are nonzero ...
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Converting to Q = ae^kt form March 1st 2010, 04:18 PM #1 Member Joined Apr 2009 Posts 83 Q = 4 * 8^1.3t How would I convert this into Q = ae^kt form? The answer in the back of the book says Q = 4e^2.703t but I have tried everything and couldn't get the same answer. Please help me with this probl...
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Sum of series to infinite $\frac{u_{n+1}}{u_n}=\ldots=\frac{n}{n+3}=\frac{ \alpha n+\beta}{\alpha n+\gamma}$ (hipergeometric series) . According to a well known theorem , $S=\frac{u_1\gamma}{\gamma-(\alpha+\beta)}=\ldots=\ frac{1}{4}$ Note that $\frac{1}{n(n+1)(n+2)} = \frac{1}{2}\left(\frac{1}{n} - \frac{1}{n+1}\righ...
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Value Distribution and Uniqueness Results of Zero-Order Meromorphic Functions to Their Discrete Dynamics in Nature and Society Volume 2012 (2012), Article ID 818052, 11 pages http://dx.doi.org/10.1155/2012/818052 Research Article Value Distribution and Uniqueness Results of Zero-Order Meromorphic Functions to Their ...
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Popularity Evaluation Model for Microbloggers Online Social Network Discrete Dynamics in Nature and Society Volume 2014 (2014), Article ID 356072, 12 pages http://dx.doi.org/10.1155/2014/356072 Research Article Popularity Evaluation Model for Microbloggers Online Social Network ^1College of Computer Science and Tech...
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Le Monde puzzle [#839] November 15, 2013 By xi'an  number theory Le Monde mathematical puzzle whose R coding is not really worth it (and which rings a bell of a similar puzzle in the past, puzzle I cannot trace…): The set Ξ is made of pairs of integers (x,y) such that (i) both x and y are written as a sum of tw...
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Find a spanning set for the space November 23rd 2010, 05:32 PM Sharpe116 Find a spanning set for the space Im not quite sure how to begin this problem Find a spanning set for the space: T(A) = {X in R^5 : AX = (A^T)X} A = 29, 9, 11, -24, -6 9 , 46, -30, -30, -25 11, -30, 95, 36, -10...
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Math Help May 4th 2009, 06:52 PM #1 Newbie Joined May 2009 Posts 16 Max/Min Let f be the function defined by f(x) = ln absolute value of $\frac{x}{1+ x ^2}$ b) Determine whether f is an even function, odd function or neither. Justify. c) At what values does f have relative maximum or minimum? ...
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predicate logic March 4th 2009, 01:23 PM #1 Junior Member Joined Feb 2009 Posts 44 predicate logic I have to express this using quantifiers, divisibility, = <= <, etc. “If a natural number is odd, then all its divisors are odd.” I was thinking of, for all 2x+1, where x is a natural number, if 2x+1 i...
4
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the encyclopedic entry of making secret In cryptography , a secret sharing scheme is verifiable if auxiliary information is included that allows players to verify their shares as consistent. More formally, verifiable secret sharing ensures that even if the dealer is malicious there is a well-defined secret that t...
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[ -0.123046875, 0.045166015625, -0.0703125, -0.043212890625, 0.0035552978515625, 0.07080078125, 0.004608154296875, 0.04248046875, 0.0693359375, 0.0162353515625, -0.01275634765625, 0.029052734375, 0.09033203125, 0.050048828125, -0.00543212890625, -0.0289306640625, 0.033203125, -0.0015...
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Exponential Decay October 11th 2008, 06:29 AM #1 Newbie Joined Oct 2008 Posts 6 Exponential Decay A first order exponential decay can be written as A(t)= Ae^(-t/r) where A(t) is the amount (of substance) after time t, A is the initial amount at time t=0 and r is the decay time. The fall time...
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3 remaining word problems. Algebra 1 November 5th 2008, 10:51 PM #1 Newbie Joined Oct 2008 Posts 9 3 remaining word problems. Algebra 1 Okay.. after getting a big packet at the start of the semester, I'm down to 3 problems out of 279 that I have no clue how to do. Please help, I want to know what I'm doi...
4
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characters of S_n from A_n December 15th 2009, 03:14 PM akc2010 characters of S_n from A_n Using Frobenius Reciprocity, derive the character table of S_n from that of A_n when (a) n = 3 (b) n = 4 (c) n = 5 December 15th 2009, 10:10 PM aliceinwonderland Quote: This is for n=5. The ch...
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the encyclopedic entry of un-necessarily In mathematics , the Jacobi elliptic functions are a set of basic elliptic functions , and auxiliary theta functions , that have historical importance with also many features that show up important structure, and have direct relevance to some applications (e.g. the equat...
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Slope Field with Solution Passing Through Point February 11th 2010, 06:36 PM pcannons Slope Field with Solution Passing Through Point Hi, This is for Calc II homework.. The figure below shows the slope field for the equation y' = sin (x) cos (y). (If you want I can post the picture, but I don't th...
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Ugh, blanking out --- complex numbers, exponents... July 7th 2010, 09:47 PM #1 Member Joined Mar 2010 Posts 175 Ugh, blanking out --- complex numbers, exponents... solve $(1-i)^{2009}$ Attempt: r = $\sqrt{2}$ tan $\Theta$ = -1 $\rightarrow$ tan $\Theta$ = $\frac{7\pi}{4}$ so... $...
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Linear Algebra- Normal and Self-Adjoint Operators December 4th 2007, 12:30 AM #1 Newbie Joined Oct 2007 Posts 6 Let T be a linear operator on an inner product space V. Determine whether T is normal, self-adjoint, or neither. If possible, produce an orthonormal basis of eigenvectors of T for V and list the...
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lenght of a curve August 10th 2009, 08:10 AM #1 Member Joined Jul 2009 Posts 127 lenght of a curve Find the length of the curve defined by y=3x3–11 from x=2 to x=10. ok i think that L= integral from 2 to 10 sqrt((dx/dt)^2+(dy/dt)^2)dt dx/dt would be 3x^3/2-11 do i get dy/dt by...
5
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Determining continuity of function. April 18th 2009, 02:50 AM #1 Junior Member Joined Jan 2009 Posts 36 Determining continuity of function. I have a question on my homework that I'm not quite sure how to solve, the textbook as usual has no examples resembling this type of question, and its just been gett...
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Probability Vectors Show that when x is a probability vector and A is a stochastic matrix, then Ax is another probability matrix You mean "then Ax is another probability vector". What are your precise definitions of "probability vector" and "stochastic matrix"? Yes, sorry. We say a vector X in Rn is a probability vec...
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Simultaneous Equation December 13th 2012, 03:46 AM kermola Simultaneous Equation Hiya, I need to find the range of values of k which give distinct roots, given the following 2 equations: kx + y = 3 x^2 + y^2 = 5 Thanks guys. Kermola December 13th 2012, 05:34 AM emakarov Re: Simultaneou...
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Infiltration: Just ACH50 Divided by 20? This article was originally published in the January/February 1994 issue of Home Energy Magazine. Some formatting inconsistencies may be evident in older archive content. | Back to Contents Page | Home Energy Ind...
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more integrals $\int \sin (101x) \sin^{99} x \ dx$ $\int_{0}^{1} \frac{\tan^{-1} x}{1+x} \ dx$ If $y=\sin(100x)\sin^{100}x$ then $y'=100\cos(100x)\sin^{100}x+100\sin(100x)\sin^{99} x\,\cos x$$=100[\sin(100x)\cos x+\cos(100x)\sin x]\sin^{99}x=100\sin(101x)\sin^{99}x$, which quickly leads to the answer. Consider the int...
5
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Definitions of Six Sigma, What is Six Sigmadefinitionsofsixsigma Non-technical Definition Of Six Sigma Six Sigma management is the relentless and rigorous pursuit of the reduction of variation in all critical processes to achieve continuous and breakthrough improvements that impact the bottom-line and / or top-line of...
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integration by parts October 18th 2009, 06:08 AM #1 Member Joined Feb 2009 Posts 91 integration by parts Hi the question is evaluate the integral integral sign (S) cos^-1 (2x) dx using integration by parts SO I let t = 2x so dt = 2 dx so dx= dt/2 So the original equation becomes S cos^-1 t ...
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Recursion via Pascal by J. S. Rohl is one of a small number of books devoted entirely to recursion in programming. Recursion is a technique where a problem is defined in terms of a simpler version of itself. The book has over 100 examples and although the code is in Pascal it shouldn't pose too much of a problem for ...
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Find the Arc Length of a Vector Function February 11th 2013, 05:42 PM #1 Member Joined Oct 2009 From Detroit Posts 157 Thanks 5 Find the Arc Length of a Vector Function the given vector and the bounds of integration are; $r_{0}=\langle\sqrt{2},e^t,e^{-t}\rangle; 0\leq t \leq 1$ different...
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Interactive Multiobjective Fuzzy Random Linear Programming through Fractile Criteria Advances in Fuzzy Systems Volume 2012 (2012), Article ID 521080, 9 pages http://dx.doi.org/10.1155/2012/521080 Research Article Interactive Multiobjective Fuzzy Random Linear Programming through Fractile Criteria ^1School of Humanit...
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PRECALCULUS HELP PLEASE! Posted by YOSHI on Saturday, April 16, 2011 at 1:26am. convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17 • PRECALCULUS HELP PLEASE! -...
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Factor exponent $K \lhd G$ has index $m$ , show that $g^m \in K$ for all $g \in G$ Thanks guys order will be $g^m=1$ where m is the copies of g So, If Kg was raised to the mth power, it would be come the inverse, bringing Kg back to K So, $kg^mk^{-1}=k \in K$ because $K\lhd G$ then $g^m\in K$ Uuuh?? Ok, let us go b...
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Counting Counting Techniques This page presents a fuller discussion of counting techniques which were employed in calculating combinations for the binomial distribution. A reasonable sequential approach considers the following [all of which are relevant to "without replacement" problems]: The basic question of how ma...
4
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Coefficient Matrix Question June 3rd 2009, 03:05 AM #1 Newbie Joined Mar 2009 Posts 5 Coefficient Matrix Question Here is the question I am having difficulty with: If the echelon form of the coefficient matrix of a homogeneous system of linear equations is: 1 2 3 0 2 1 0 0 1 1 2 0 0 0 0...
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Homework Help Posted by sphere on Tuesday, August 23, 2011 at 11:56am. First of all let me apologize if this is the wrong section; this is a review question from a Calculus III class, but it doesn't involve any actual calculus so I posted it here. If I have a sphere with center (2,-10,4) and radius 10 what is: the i...
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Euler totient function Hi, Can someone please tell me how to compute the Euler totient function for large values of n? e.g n=3800. Me I fire up Euler and type: Code: >load "C:\Documents and Settings\CB\My Programs\Euler23\Euler Utils\number theory.e"; > > >EulerTotient(3800) 1440 >Where EulerTotient is defined as: Cod...
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Homework Help Posted by nesri on Tuesday, October 5, 2010 at 8:06am. A shark, looking for dinner, is swimming parallel to a straight beach and is 90 meters offshore. The shark is swimming at a constant speed of 30 meter per second. At time t = 0, the shark is directly opposite a lifeguard station. How fast is the shar...
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Help- Newton - Raphson Method July 11th 2006, 02:17 PM fair_lady0072002 Help- Newton - Raphson Method Consider the function f(x) = x- 4 In x Show that the equation f(x) = 0 has a solution in the interval (1,2) Show that for this function f the Newton - raphson method formula can be expressed as xn +1 =...
5
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A Variational Approach to an Inhomogeneous Second-Order Ordinary Differential System Abstract and Applied Analysis Volume 2013 (2013), Article ID 197219, 4 pages http://dx.doi.org/10.1155/2013/197219 Research Article A Variational Approach to an Inhomogeneous Second-Order Ordinary Differential System International I...
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Strange angle differentiation May 31st 2008, 06:53 PM Blackstar347 Strange angle differentiation Ok first time being here but I could use some help. The problem is this. -There are 2 blood vessels seperated by angle X -These two blood vessels have radii of R and r respectively -The length "a" is the...
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search results Expand all Collapse all Results 1 - 3 of 3 1. CJM 2001 (vol 53 pp. 434) Values of the Dedekind Eta Function at Quadratic Irrationalities: Corrigendum Habib Muzaffar of Carleton University has pointed out to the authors that in their paper [A] only the result \[ \pi_{K,d}(x)+\pi_{K^{-1},d}(x)=\...
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al Finding all roots for a polynomial with either real or complex coefficients. Let the polynomial be given by: f(x)=a[n]x^n+a[n-1]x^n-1....a[1]x+a[0] Where a [n] is either a real or complex number. We try to find all roots to this polynomial by solving the equation for x. a[n]x^n+a[n-1]x^n-1....a[1]x+a[0]=0 The...
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Math Help September 11th 2009, 02:08 AM #1 Junior Member Joined Sep 2008 Posts 39 Bijection .to construct a bijection between [0,1] and [0,1)...................... I just think it is impossible , cuz the second one is one element less than the first.... Well by that logic it would then b...
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Homework Help Posted by ramana on Wednesday, June 18, 2008 at 3:36pm. what rate willl an amount double itself in 20 years at simple interest? • 10th - DrBob222, Wednesday, June 18, 2008 at 3:59pm (1.00+x)^20 = 2 where x is the percent. If we call 1.00 + x = Y, then (Y)^20 = 2 20*log(Y) = log 2 20*l...
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polya strikes out April 29th 2007, 07:58 AM #1 Junior Member Joined Feb 2007 Posts 32 polya strikes out Write down the numbers 1,2,3,4,... in a row Srike out every third so we are left with 1,2,4,5,7,8,10... now write their cumulative sums of what remains. We are given 1,3,7,12,19,27,37.....
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reddit's stories are created by its users Is there something going on with signal processing? by jubjub7in ECE [–]ButteryGreg0 points1 point2 points Hmm, that is a bit tricky. I don't have too much experience specifically in industry with this because I'm still a grad student, but based on our group's needs and our...
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Finite-dimensional subspaces..? May 5th 2009, 05:51 AM #1 Finite-dimensional subspaces..? Let U, V, W be finite-dimensional subspaces of a real vector space. Show dim U + dim V + dim W - dim (U + V + W) greater or equal to max {dim (U intersection V), dim (V intersection W), dim (U intersection W)}. - as...
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Trigonometric Ratio Problems April 26th 2010, 07:03 AM #1 Newbie Joined Dec 2009 Posts 9 Trigonometric Ratio Problems 10) Three circles with centres A, B and C are mutually tangent and no circle lies inside another circle. The circle with centre A has a radius of 3 cm and the circle with centre B has a r...
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State-Feedback Stabilization for a Class of Stochastic Feedforward Nonlinear Time-Delay Systems Abstract and Applied Analysis Volume 2013 (2013), Article ID 151374, 8 pages http://dx.doi.org/10.1155/2013/151374 Research Article State-Feedback Stabilization for a Class of Stochastic Feedforward Nonlinear Time-Delay Sy...
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Locus of 2 gradients? August 8th 2006, 10:30 PM #1 Junior Member Joined May 2006 From Sydney, Australia Posts 44 Locus of 2 gradients? I didn't know which forum to put it in, but I thought this was the most appropriate. This is the question: Given two points A(3,-2) and B(-1,7), find the equ...
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Simple Differential eq Is this correct? $\frac{dy}{dx} = 3x^2y$ $\frac{1}{y} dy = 3x^2dx$ $\int\frac{1}{y}dy= \int(3x^2dx)$ $\ln|x| = x^3dx + C$ Last edited by xterminal01; January 2nd 2010 at 07:08 AM. Almost. Just finish up. $y=e^{x^{3}+C}$ $y=e^{x^{3}}\cdot e^{C}$ But, $e^{C}$ is a constant we can call, say, K. $y...
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Optimization Problems (time & distance) July 25th 2009, 05:35 AM #1 Newbie Joined Mar 2009 Posts 12 Hi everyone, I'm having some trouble with these 2 problems. Hope you can help me out. 1. A toy tugboat is launched from the side of a pond and travels north at 5 cm/s. At the same moment, a toy launch ...
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Integration of dx/[(1-2x)^2*(3-x)] March 17th 2009, 12:03 AM #1 Newbie Joined Mar 2009 Posts 10 Integration of dx/[(1-2x)^2*(3-x)] I have attempted to solve this integration problem by parts but I have not been able to arrive at the final answer. Can anyone help? Problem: integration of dx/[(1-2x)^2...
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Modeling Hysteresis with Inertial-Dependent Prandtl-Ishlinskii Model in Wide-Band Frequency-Operated Piezoelectric Actuator Smart Materials Research Volume 2012 (2012), Article ID 164062, 15 pages http://dx.doi.org/10.1155/2012/164062 Research Article Modeling Hysteresis with Inertial-Dependent Prandtl-Ishlinskii Mod...
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A question in Multivariable Calculus November 29th 2006, 04:48 AM Jenny20 A question in Multivariable Calculus Question (1/3sqrt(2) )*<1,1,4> is a unit vector pointing in a direction opposite to the vector <-3,-3,-12>. The answer is TRUE Can you show me the working step of this question? Thank you ...
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problem on Trace of the sum of two matrices October 17th 2012, 07:37 AM #1 Member Joined Jul 2009 Posts 111 Thanks 1 The following question is in the exercise of my text book. A is 4x4 matrix with 1,-1,2 and -2 as its four eigen values. If B = A^4 - 5A^2 + 5I, which of the following is true? ...
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How would I factor these polynomials completely? August 29th 2007, 07:08 PM #1 Junior Member Joined Aug 2007 Posts 58 How would I factor these polynomials completely? I was supposed to factor $16p^2-64$, and following the steps I ended up with $8(2p^2-8)$ I don't think that's factored COMPLETELY though? ...
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How to get this matrix to RREF July 6th 2010, 07:24 PM Jasked How to get this matrix to RREF I'm just trying to figure out how to get this to rref: x + 5y + z = 0 x + 6y - z = 0 2x + ay + bz = c 1 5 1 0 1 6 -1 0 2 a b c I know the following is the answer, but I'm now sure how to get...
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Math Help June 16th 2008, 01:27 PM #1 Junior Member Joined Apr 2008 Posts 30 Trig Heres the question, a full solution step by step is great as i already know the process to answer a question like this but have trouble doing so.\ $tanx-sinx/tanxsinx = tanxsinx/tanx+sinx$ Hi again ! I must ...
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Euler's Theorem Questions October 7th 2010, 07:46 AM #1 Member Joined Nov 2008 Posts 152 Euler's Theorem Questions 1) Find the last digit of the decimal expansion of $7^{999,999}$ 2) Show that if a is an integer such that a is not divisible by 3 or such that a is divisible by 9, then $a^7$ = a (mod ...
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(CALC) limits problem • /r/cheatatmathhomework all 12 comments [–]needuhLee0 points1 point2 points sorry, this has been archived and can no longer be voted on [–]needuhLee0 points1 point2 points sorry, this has been archived and can no longer be voted on Probably because the proof of L'Hopital's rule requires a lo...
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Vectors-finding distance Find the distance of coordinate (1,0,0) from the line r=t(12i-3j-4k) kingkaisai2 Although there is a formula, use the following(you can derive the formula using it) One thing I want to say is that the distance between a line and a point is the length of the perpendicular drawn from the the poi...
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linear algebra how do i know that if A*A^-1=I then A^-1*A=I when A is a matrix You do not. You need to show that. Matrix Multiplication is not commutative. Though it is interesting, if something is left inverse is it right inverse, by square matrices? I do not think so, (In general groups the answer is no, but these a...
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Homework Help Posted by jule on Thursday, August 9, 2012 at 6:13pm. john has a loan but doesn't begin to repay his loan for 11 months, at a rate of $500 every month of four month. the interest rate is 8% compounded monthly determin the size of the loan using the following 2 steps 1. calculate the present value, pv1 o...
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function is defined by folliowing rule question. December 8th 2009, 09:30 PM thcbender function is defined by folliowing rule question. a function is defiend by the following rule: f (x) is 0 if x lesser than/equal to -3 -1 if -3<x<0 x if x is greater then or equal to 0 find i) F (-3) + f...
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Uncomputability of the identity relation on computable real numbers up vote 3 down vote favorite 1 Let $f_{=}$ be a function from $\mathbb{R}^{2}$ be defined as follows: (1) if $x = y$ then $f_{=}(x,y) = 1$; (2) $f_{x,y} = 0$ otherwise. I would like to have a proof for / a reference to a textbook proof of the followi...
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Sequences (arithmetic/geometric) October 29th 2009, 02:16 AM #1 Junior Member Joined Aug 2009 Posts 31 Sequences (arithmetic/geometric) Let ak= 3^k, bk=5k-3 and ck= ak+bk =3^k +5k-3 a/ which type of sequence is ak and write out a formula for the value of a1+a2+...+an. b/ which type ...
4
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Simple Linearization Problem February 20th 2011, 05:56 PM #1 Member Joined Jan 2011 Posts 156 Simple Linearization Problem I must be losing my mind because I've been over and over this one and can't see what I am doing wrong: Find the linearization L(x) of the function $f(x) = cos(x)$ at $a = \frac{...
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Related rates of change. June 19th 2010, 02:31 AM #1 Junior Member Joined Dec 2007 Posts 41 Related rates of change. A cylindrical container of fixed length 90 cm is being pressure tested, and the radious id increasing at a constant rate of .01 cm/min. WHen the redious is 25 cm, find the rate of the chan...
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Oscillatory and Asymptotic Properties on a Class of Third Nonlinear Dynamic Equations with Damping Term on Time Scales Abstract and Applied Analysis Volume 2013 (2013), Article ID 340574, 17 pages http://dx.doi.org/10.1155/2013/340574 Research Article Oscillatory and Asymptotic Properties on a Class of Third Nonlinea...
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Differential Equation help December 5th 2009, 12:16 PM #1 Differential Equation help I have the DE, $\frac{dP}{dt} = B_0e^{-at}P$, which I've solved to give $P = P_0 e^{\frac{B_0}{a}\left(1 - e^{-at}\right)}$. I'm also given that $B(t) = B_0e^{-at}$ and that $P(0) = P_0$. Q) Suppose that at time $t = 0$...
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Math Help October 27th 2009, 01:49 PM #1 ring Let $I$ and $K$ be ideals in a ring $R$ with $J \subseteq I$. Prove that $I/K = \{a+K: a \in I \}$ is an ideal in the quotient ring $R/K$. Closure under subtraction follows from the fact that $I$ is an ideal. Suppose $r+K \in R/K$ and $a+K \in I/K$. Then $(...
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How to simplify an equation? August 27th 2013, 04:55 PM tabibito How to simplify an equation? Hello, I have the following problem. There are known dependencies between variables. $a = a1 + a2.$ $C = C1 + C2.$ $C = \frac{a}{{{{\left( {1 + d} \right)}^t}}},C1 = \frac{{a1}}{{{{\left( {1 + d1} \ri...
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