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Question Number 97132 by student work last updated on 06/Jun/20

$$\mathrm{is}\mathrm{the}\mathrm{formulla}\mathrm{of}\sin {}^3(\frac{\pi }{2}+\mathrm{x})=\cos {}^3\mathrm{x}\mathrm{correct}?$$

Commented by student work last updated on 06/Jun/20

$$\mathrm{ans}\mathrm{me}$$

Answered by Ar Brandon last updated on 06/Jun/20

$$\sin (\frac{\pi }{2}+\mathrm{x})=\sin (\frac{\pi }{2}-\mathrm{x})=\mathrm{cosx}$$$$\mathrm{thus}{\sin }^3(\frac{\pi }{2}+\mathrm{x})={\cos }^3\mathrm{x}$$

Commented by student work last updated on 06/Jun/20

$$\mathrm{thanks}$$

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