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Trigonometry and Modelling

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Question 3

Prove the identity:

1−2sin⁡2xcos⁡x−sin⁡x≡cos⁡x+sin⁡x \frac{1 - 2\sin^2 x}{\cos x - \sin x} \equiv \cos x + \sin x cosx−sinx1−2sin2x​≡cosx+sinx
[2]

Trigonometry and Modelling Questions

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