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Prove the Identity cos⁡2x−sin⁡2x=1−2sin⁡2x\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } x

Question 311

Essay

Prove the identity.
- cos⁡2x−sin⁡2x=1−2sin⁡2x\cos ^ { 2 } x - \sin ^ { 2 } x = 1 - 2 \sin ^ { 2 } x

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