Question

Use a cofunction identity to write an equivalent expression: sin(pi/6 - theta)

Answer 1

sin (a-b)= (sin a * cos b) - (sin b * cos a)
sin(pi/6 - theta) =(sin pi/6*cosФ ) -( sinФ * cos pi/6) = 1/2 cos Ф - √3/2 sin Ф