SOLUTION: Verify the identity. cos (x - y) - cos (x + y) = 2 sin x sin y

Algebra ->  Trigonometry-basics -> SOLUTION: Verify the identity. cos (x - y) - cos (x + y) = 2 sin x sin y       Log On


   

Question 698216: Verify the identity.
cos (x - y) - cos (x + y) = 2 sin x sin y
Answer by lynnlo(4176) About Me  (Show Source):
You can put this solution on YOUR website!
2sin(x)sin(y)=cos(x-y)-cos(x+y)