Question: Prove the following identities a) cos 5 = cos 2 sin cos + cos sin 4 b) (4 sin + 3 cos)

Prove the following identities 

a) cos5 θ = cosθ − 2 sin²θ cosθ + cosθ sin4θ

b) (4 sinθ + 3 cosθ)² + (3 sinθ − 4 cosθ)² = 25

c)

tan A - tan B = sin A - sin B cos

tan A - tan B = sin A - sin B cos A cos B

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