Prove the identity. sin 3 + sin = 2 sin 2 cos

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Prove the identity.

sin 3θ + sin θ = 2 sin 2θ cos θ

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Calculus Early Transcendentals

ISBN: 9781337613927

9th Edition

Authors: James Stewart, Daniel K. Clegg, Saleem Watson, Lothar Redlin

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