Question

Write the expression as the sine, cosine, or tangent of an angle.

cos 107° cos 42° + sin 107° sin 42°

Answer 1

These are the answers

sin 65°

cos 65°

cos 149°

sin 149°

Answer 2

No this is not about triangles I'm afraid.

Answer 3

just use the identities like
\[\huge \cos(A-B)=\cos A \cos B + \sin A \sin B\]

Answer 4

So cos(107-42)?

Answer 5

yes!

Answer 6

Yay which equals 65! Thanks!

Answer 7

welcome!