Question

Verify the identity.

Answer 1

\[\cos(\alpha - \beta) - \cos(\alpha+\beta) = 2 \sin \alpha \sin \beta \]

Answer 2

@amistre64

Answer 3

that looks like an identity setup proofer

Answer 4

do you recall the identity for cos(a+b)?

Answer 5

cos(a+b) = cos(a)cos(b)-sin(a)sin(b)

cos(a-b) = cos(a)cos(b)+sin(a)sin(b)

Answer 6

sorry @amistre64 im confused & i was eating!