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16-10-2020
Mathematics

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Rewrite with only sin x and cos x. sin 3x - cos x

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2612rashi 2612rashi

16-10-2020

Answer:

sin(3x) = sin(x + 2x)

= sinx cos(2x) + cosx sin(2x)

= sinx [1 - 2sin2x] + cosx [2sinxcosx]

= sinx - 2sin3x + 2cos2xsinx

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