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3.5 Trigonometry (A-level only)

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Question 2

Prove the identity:

cos⁡2θcos⁡θ−sin⁡θ≡cos⁡θ+sin⁡θ \frac{\cos 2\theta}{\cos \theta - \sin \theta} \equiv \cos \theta + \sin \theta cosθ−sinθcos2θ​≡cosθ+sinθ
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3.5 Trigonometry (A-level only) Questions

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