Question

Need help with this, givign 50 points

Answer 1

description

Explanation:

you have to use the sum/difference identitiy

cos(5pi/3)cos(theta)-sin(5pi/3)sin(theta)

1/2cos(theta)-sqrt(3)/2sin(theta

both have 1/2 so you can take it out

1/2(cos(theta))-sqrt(3)sin(theta))