Question

If A = 300 , verify that (1) cos 2 A= cos2 A – sin2 A = 2 cos2 A – 1, (2) sin 2A = 2 sin A cos, A (3) cos 3 A = 4 cos2 A – 3 cos A, (4) sin 3 A = 3 sin A – 4 sin2A, and (5) 22tantan21tanAAA

Answer 1

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