Evaluate the following expressions. Your answer must be an angle in radians and in the interval $[-\pi/2 , \pi/2 ]$. Note that $\pi$ is already provided in the answer so you just have to write the appropriate multiple. E.g. if the answer is $\pi /2$ you should write 1/2. Do not use decimal numbers. The answer should be a fraction or an integer.

(a) $\tan^{-1}(\tan(2\pi/3)) =$ $\pi$

(b) $\tan^{-1}(\tan(-7\pi/4)) =$ $\pi$

(c) $\tan^{-1}(\tan(3\pi/4)) =$ $\pi$