Question: a) Prove the identity cos 4 sin 4 = 2 cos 1. b) Solve the equation cos 4 sin

a) Prove the identity cos4 θ − sin4 θ = 2 cos²θ − 1.

b) Solve the equation cos4 θ − sin4 θ = 0 for 0° ≤ θ ≤ 360°.

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