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Verify That Each Equation Is an Identity $\cos ( 3 x ) = \cos ^ { 3 } x - 3 \sin ^ { 2 } x \cos x$

Question 150

Essay

Verify that each equation is an identity.
- $\cos ( 3 x ) = \cos ^ { 3 } x - 3 \sin ^ { 2 } x \cos x$

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