sally282004 sally282004

22-07-2022
Mathematics

contestada

Prove the following identities.
cos(3pi/s+x)=sinx

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Medunno13 Medunno13

25-07-2022

[tex]\cos \left(\frac{3\pi}{2}-x \right)=\sin x \\ \\ =\cos \left(\frac{3\pi}{2} \right)\cos x -\sin \left(\frac{3\pi}{2} \right) \sin x \\ \\ =0\cos x -(-1)(\sin x) \\ \\ =\sin x[/tex]

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