Answer
arctan$ 0=0$
Work Step by Step
lnverse Tangent Function
$y=\tan^{-1}x$ or $y=$ arctan $x$ means that $x=\tan y$, for $-\displaystyle \frac{\pi}{2} < y < \frac{\pi}{2}$.
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In the interval$\quad -\displaystyle \frac{\pi}{2} < y < \frac{\pi}{2}$ ,
we find $y=0$ to be such that $\tan 0=0$.
So,
$y=\arctan 0=0$
