## Precalculus (6th Edition)

$x=\arcsin(4y)$
The goal is to isolate x. Multiply with 4 ... $4y=\sin x$ $\qquad$ ...use the definition of arcsin $\arcsin 4y=x$ (4y is the number from $[-\displaystyle \frac{\pi}{2}, \displaystyle \frac{\pi}{2}]$ such that $\sin x$=4y)