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Prove the Identity sin⁡3x=4sin⁡xcos⁡2x−sin⁡x\sin 3 x=4 \sin x \cos ^{2} x-\sin x

Question 49

Essay

Prove the identity:
sin⁡3x=4sin⁡xcos⁡2x−sin⁡x\sin 3 x=4 \sin x \cos ^{2} x-\sin x

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