a. Use the expansions of cos(2x + x) to show that cos 3x 4 cos 3
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a. Use the expansions of cos(2x + x) to show that cos 3x Ξ 4 cos3 x − 3cos x.
b. Express sin3x in terms of sin x.
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a Use the expansions of cos2x x to show that cos 3x 4 cos3 x 3co...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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