Question

Evaluate a) sin (4pi/3) b) cos (5pi/6)

Answer 1

Sin(4π/3)= -√3/2
cos(5π/6)= -√3/2

Answer 2

The correct answers are:

a) sin (4π/3) = $- \frac{ \sqrt{3} }{2}$
b) cos (5π/6) = $- \frac{ \sqrt{3} }{2}$

I hope this helps.