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

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

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

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