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