Question: a. Prove the identity cos 4 sin 4 2 cos 2 1. b. Hence, solve the equation cos0 - sin0

a. Prove the identity cos4θ− sin4θ ≡ 2 cos2θ − 1.

b. Hence, solve the equation

cos0 - sin0 = for 0 0 360.

cos0 - sin0 = for 0 0 360.

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