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Verify That Each Equation Is an Identity $\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos ( 2 x ) + \cos ( 4 x ) )$

Question 152

Essay

Verify that each equation is an identity.
- $\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos ( 2 x ) + \cos ( 4 x ) )$

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