Use the expansions of cos(3x x) and cos(3x + x) to prove the identity: cos 2x

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Use the expansions of cos(3x − x) and cos(3x + x) to prove the identity:

cos 2x − cos 4x Ξ 2 sin3x sin x

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Cambridge International AS & A Level Mathematics Pure Mathematics 2 & 3 Coursebook

ISBN: 9781108407199

1st Edition

Authors: Sue Pemberton, Julianne Hughes, Julian Gilbey

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Question Posted: Mar 14, 2023 07:17 AM

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Use the expansions of cos(3x x) and cos(3x + x) to prove the identity: cos 2x

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We start by using the expansions of cos3x x and cos3x x cos3x x cos2x cos3x x cos4x Now we can rewri...View the full answer

Cambridge International AS & A Level Mathematics Pure Mathematics 2 & 3 Coursebook

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