precalculus hw im stuck

Question

If ,

then =  

  =  

 Give exact values. No decimals allowed!Example: Enter sqrt(2)/2 for . With functions like sqrt, be sure to use function notation (parentheses). sqrt(2)/2 will work, but sqrt2/2 will not.

Answer 1

5pi/6 = 150 degrees

reference angle = 30 degrees

sin(5pi/6) = 1/2

cos(5pi/6) = -(1/2)sqr3