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Verify That Each Equation Is an Identity (1−cos⁡x)(1+cos⁡x)=sin⁡2x( 1 - \cos x ) ( 1 + \cos x ) = \sin ^ { 2 } x

question 38

Essay

Verify that each equation is an identity.
- (1−cos⁡x)(1+cos⁡x)=sin⁡2x( 1 - \cos x ) ( 1 + \cos x ) = \sin ^ { 2 } x

Definitions:

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