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Prove the Identity cos⁡4x=18(3+4cos⁡2x+cos⁡4x)\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos 2 x + \cos 4 x )

Question 261

Essay

Prove the identity.
- cos⁡4x=18(3+4cos⁡2x+cos⁡4x)\cos ^ { 4 } x = \frac { 1 } { 8 } ( 3 + 4 \cos 2 x + \cos 4 x )

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\[\begin{array} { l }
\cos ^ { 4 } x = ...

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