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Cos(3x) = cos^2x - 3sin^2x cosx
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Cos(3x) = cos^2x - 3sin^2x cosx

User Flux
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\cos3x=\cos(2x+x)=\cos2x\cos x-\sin2x\sin x

=(\cos^2x-\sin^2x)\cos x-2\sin^2x\cos x

=\cos^3x-3\sin^2x\cos x
User K M Dilshan Udara
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