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OpenStudy (anonymous):
Rewrite cos 3x with only sin x and cos x
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OpenStudy (sidsiddhartha):
start with this Cos(A+B) = CosA.CosB - SinA.SinB here cos(x+2x) = cosx.cos2x - sinx.sin2x
OpenStudy (sidsiddhartha):
now use cos(2x)=(2cos^2x - 1) and sin2x=2sinx.cosx
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