| Problem: | |
| Find the inverse of the following function: $\cos (8-x)$ | |
| Answer: | |
| $\left\{\left\{x\to \fbox{$-\cos ^{-1}(y)-2 \pi c_1+8\text{ if }c_1\in \mathbb{Z}\land -1\leq y\leq 1$}\right\},\left\{x\to \fbox{$\cos ^{-1}(y)-2 \pi c_1+8\text{ if }c_1\in \mathbb{Z}\land -1\leq y\leq 1$}\right\}\right\}$ |