a. Use the expansions of cos(2x + x) and cos(2x x) , to prove that: cos
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a. Use the expansions of cos(2x + x) and cos(2x − x) , to prove that:
cos 3x + cos x + 2 cos 2x cos x
b. Solve cos 3x + cos 2x + cos x > 0 for 0°< x < 360°.
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ANSWER a Using the expansions of cos2x x and cos2x x we have cos2x x cos2xcosx sin2xsinx cos2x x cos...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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