Write the word or phrase that best completes each statement or answers the question.
-$$\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos 2 x + \cos 4 x )$$

Name: Write the word or phrase that best completes each statement or answers the question. -\[\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos 2 x + \cos 4 x )\]
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The Answer of Write the word or phrase that best completes each statement or answers the question.
-$$\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos 2 x + \cos 4 x )$$

Write the Word or Phrase That Best Completes Each Statement cos⁡4x=18(3+4cos⁡2x+cos⁡4x)\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos 2 x + \cos 4 x )cos4x=81​(3+4cos2x+cos4x)

Write the Word or Phrase That Best Completes Each Statement $\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos 2 x + \cos 4 x )$