Question

EXERCISE 1B (COMPOUND ANGLES)

1. cos (0 + a) cos (0 - a) + sin(0+ a) sin (0-a)=
1) cos 2a
2) sin 2a
3) cot 2a
4) tan 2a
it's not zero it's theta , not 'a' its alpha​

Answer 1

Answer:

plzzz give me brainliest ans and plzzzz follow me