Write the word or phrase that best completes each statement or answers the question.
Establish the identity.
-$$\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } x$$

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The Answer of Write the word or phrase that best completes each statement or answers the question.
Establish the identity.
-$$\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } x$$

Write the Word or Phrase That Best Completes Each Statement cos⁡2x−sin⁡2x=1−2sin⁡2x\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } xcos2x−sin2x=1−2sin2x

Write the Word or Phrase That Best Completes Each Statement $\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } x$