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1.7 Trigonometry

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Question 5

Prove the identity:

cos⁡2xcos⁡x+sin⁡x≡cos⁡x−sin⁡x \frac{\cos 2x}{\cos x + \sin x} \equiv \cos x - \sin x cosx+sinxcos2x​≡cosx−sinx
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1.7 Trigonometry Questions

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