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

Question 193

Essay

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

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