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Question Number 163197 by abdullahhhhh last updated on 04/Jan/22

Commented by cortano1 last updated on 05/Jan/22

$$\cos 5x=\cos {}^{5}x-10\sin {}^{2}x\cos {}^{3}x+5\sin {}^{4}x\cos x$$$$\sin 4x=4\sin x\cos {}^{3}x-4\sin {}^{3}x\cos x$$$$\cos 3x=\cos {}^{3}x-3\sin {}^{2}x\cos x$$

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