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Prove the Identity cos⁡(x+(y−π2))=sin⁡(x+y)\cos \left( x + \left( y - \frac { \pi } { 2 } \right) \right) = \sin ( x + y )

Question 186

Essay

Prove the identity.
- cos⁡(x+(y−π2))=sin⁡(x+y)\cos \left( x + \left( y - \frac { \pi } { 2 } \right) \right) = \sin ( x + y )

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\[\begin{array} { l }
\cos \left( x + \...

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