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Write the Word or Phrase That Best Completes Each Statement cos⁡(x+π2)=−sin⁡x\cos \left( x + \frac { \pi } { 2 } \right) = - \sin x

Question 273

Essay

Write the word or phrase that best completes each statement or answers the question.
Establish the identity.
- cos⁡(x+π2)=−sin⁡x\cos \left( x + \frac { \pi } { 2 } \right) = - \sin x

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