Verify That the Equation Is an Identity $$\sin ( x + y ) - \sin ( x - y ) = 2 \cos x \sin y$$

question 54

Essay

Verify that the equation is an identity.
- $$\sin ( x + y ) - \sin ( x - y ) = 2 \cos x \sin y$$

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The act of introducing something new, fresh, or unusual into a situation or environment.

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