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

User Liem
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\cos \left((3\pi)/(2)-x \right)=\sin x \\ \\ =\cos \left((3\pi)/(2) \right)\cos x -\sin \left((3\pi)/(2) \right) \sin x \\ \\ =0\cos x -(-1)(\sin x) \\ \\ =\sin x

User Mohith Km
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