Verify That the Equation Is an Identity $$\sin \left( \frac { 3 \pi } { 2 } - \theta \right) = - \cos \theta$$

question 119

Essay

Verify that the equation is an identity.
- $$\sin \left( \frac { 3 \pi } { 2 } - \theta \right) = - \cos \theta$$

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Definitions:

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