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Verify the Identity cos⁡4θ=2cos⁡2(2θ)−1\cos 4 \theta = 2 \cos ^ { 2 } ( 2 \theta ) - 1

Question 111

Essay

Verify the identity.
- cos⁡4θ=2cos⁡2(2θ)−1\cos 4 \theta = 2 \cos ^ { 2 } ( 2 \theta ) - 1

Correct Answer:

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