Use de Moivre's formula (Sec. 7) to derive the following trigonometric identities: (a) cos 3 = cos3

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Use de Moivre's formula (Sec. 7) to derive the following trigonometric identities:
(a) cos 3θ = cos3 θ − 3 cos θ sin2 θ;
(b) sin 3θ = 3 cos2 θ sin θ − sin3 θ.

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Complex Variables and Applications

ISBN: 978-0073051949

8th edition

Authors: James Brown, Ruel Churchill

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Question Posted: Jun 01, 2016 01:35 AM

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Use de Moivre's formula (Sec. 7) to derive the following trigonometric identities: (a) cos 3 = cos3

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We know from de Moivres formula that cos isin 3 cos 3 i sin 3 or cos 3 3 cos 2 ...View the full answer

Complex Variables and Applications

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