Answer:
[tex]3\pi /2[/tex]
Step-by-step explanation:
The function sin(x) adopts the value -1 for x = [tex]3\pi /2[/tex].
That is when the segment pictured in red in the attached image is pointing from the center of the circle down. Recall that the sin function gives us the y-readout of the free end of the rotating segment in the unit circle.
