Range of inverse trig answers

One more thing about the inverse functions. Inverse sine and inverse tangent always answer between $\displaystyle -90^{\circ}$ and $\displaystyle 90^{\circ}$, and inverse cosine between $\displaystyle 0^{\circ}$ and $\displaystyle 180^{\circ}$. In radians, that is $\displaystyle -\frac{\pi}{2}$ to $\displaystyle \frac{\pi}{2}$, and $\displaystyle 0$ to $\displaystyle \pi$. In grads, $\displaystyle -100$ to $\displaystyle 100$, and $\displaystyle 0$ to $\displaystyle 200$.

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