Question

15. Use the unit circle to find the value of sin 3x/2 and cos 3x/2

Answer 1

3xpi/2 is 270 degree counter-clockwise from Ox

That time P(x,y) is (0,-1)

=> x= 0 and y = -1 as you can see in picture.

=> Cos 3pi/2 = x = 0

=> Sin 3pi/2 = y = -1

Explanation:

Not so slow.