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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−10sin^2 x cos^3 x+5sin^4 x cos x  sin 4x=4sin x cos^3 x−4sin^3 x cos x  cos 3x=cos^3 x−3sin^2 x cos x

$$\mathrm{cos}\:\mathrm{5}{x}=\mathrm{cos}\:^{\mathrm{5}} {x}−\mathrm{10sin}\:^{\mathrm{2}} {x}\:\mathrm{cos}\:^{\mathrm{3}} {x}+\mathrm{5sin}\:^{\mathrm{4}} {x}\:\mathrm{cos}\:{x} \\ $$$$\mathrm{sin}\:\mathrm{4}{x}=\mathrm{4sin}\:{x}\:\mathrm{cos}\:^{\mathrm{3}} {x}−\mathrm{4sin}\:^{\mathrm{3}} {x}\:\mathrm{cos}\:{x} \\ $$$$\mathrm{cos}\:\mathrm{3}{x}=\mathrm{cos}\:^{\mathrm{3}} {x}−\mathrm{3sin}\:^{\mathrm{2}} {x}\:\mathrm{cos}\:{x}\: \\ $$

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