Prove the Identity $$\cos \left( x + \left( y - \frac { \pi } { 2 } \right) \right) = \sin ( x + y )$$

question 186

Essay

Prove the identity.
- $$\cos \left( x + \left( y - \frac { \pi } { 2 } \right) \right) = \sin ( x + y )$$

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