Verify the identity: cos 4x + cos 2x = 2 - 2sin2(2x) - 2sin2(x)

1.	Verify the identity: cos 4x + cos 2x = 2 - 2sin2(2x) - 2sin2(x)
Answer» Verify the identity: cos 4x + cos 2x = 2 - 2sin²(2x) - 2sin²(x) Solution:

Discussion