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

Question 234

Essay

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

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