Question

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

cos 112° cos 45° + sin 112° sin 45°

Answer 1

Please consider the expansion of \(\cos(a-b)\).

Answer 2

@tkhunny So it is cos(112-45)= cos67?

Answer 3

Are you asking or are you sure? You should strive for the latter.

Answer 4

@tkhunny im sure

Answer 5

That's the spirit! Good work.