Answer
a) $\pi /2$
b) $\pi/2$
c) $\pi /3$
Work Step by Step
First, one must find the intervals of each function. For sin$^{-1}$ is $-\frac{\pi}{2} \leq x \leq \frac{\pi}{2}$. For tan$^{-1}$ is also $-\frac{\pi}{2} \leq x \leq \frac{\pi}{2}$. And for cos$^{-1}$ is $0 \leq x \leq \pi$
Then, one must find the angle that gives the y-value in sin$^{-1}$, x-value in cos$^{-1}$, or the slope in tan$^{-1}$, and that fits inside the given intervals.
