Use the identity sin 2x = 2 sin x cos x to find d/dx (sin 2x). Then

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Use the identity sin 2x = 2 sin x cos x to find d/dx (sin 2x). Then use the identity cos 2x = cos2 x - sin2 x to express the derivative of sin 2x in terms of cos 2x.

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Calculus Early Transcendentals

ISBN: 978-0321947345

2nd edition

Authors: William L. Briggs, Lyle Cochran, Bernard Gillett

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