# How do you find the exact value of arcsin(1) - arcsin(-1)?

$- \pi$
$\arcsin \left(1\right) - \to \frac{\pi}{2}$
$\arcsin \left(- 1\right) - \to \frac{3 \pi}{2}$
$\arcsin \left(1\right) - \arcsin \left(- 1\right) = \frac{\pi}{2} - \frac{3 \pi}{2} = - \frac{2 \pi}{2} = - \pi$