Question

Refer to the graph of y = sin(x) or y = cos(x) to find the exact values of x in the interval [0, 4π] that satisfy the equation.
4 sin(x)=-4

Answer 1

For which values of x does
sin(x)=-1 ?

Answer 2

Here is one
\[
x= \frac {3 \pi} 2
\]

Answer 3

What is the other one?