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Prove the Identity cos⁡4x+cos⁡2x=2−2sin⁡22x−2sin⁡2x\cos 4 x + \cos 2 x = 2 - 2 \sin ^ { 2 } 2 x - 2 \sin ^ { 2 } x

Question 114

Essay

Prove the identity.
- cos⁡4x+cos⁡2x=2−2sin⁡22x−2sin⁡2x\cos 4 x + \cos 2 x = 2 - 2 \sin ^ { 2 } 2 x - 2 \sin ^ { 2 } x

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\[\begin{array} { l }
\cos 4 x + \cos 2...

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