Prove that: "sin" 4A=4 sin A cos^(3)...

Prove that:
`"sin" 4A=4 sin A cos^(3)A-4 cos A "sin"^(3)A`.

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MODERN PUBLICATION-TRIGONOMETRY-Exercise 3(g)Long Answer type Question-I

Prove that: "sin" 4A=4 sin A cos^(3)A-4 cos A "sin"^(3)A.
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