Sum & Difference Identities

Question 1

What are the 2 formulas?

Answer 1

1. sin ( A +/- B ) =
2. cos ( A +/- B ) =

Question 2

1. sin ( A +/- B ) =

Answer 2

sin A cos B +/- cos A sin B

Question 3

2. cos ( A +/- B ) =

Answer 3

cos A cos B -/+ sin A sin B