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3.4 Trigonometry (A-level only)
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Prove the identity:
cos2θcosθ−sinθ≡cosθ+sinθ \frac{\cos 2\theta}{\cos \theta - \sin \theta} \equiv \cos \theta + \sin \theta
cos
θ
−
sin
θ
cos
2
θ
≡
cos
θ
+
sin
θ
[2]
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3.4 Trigonometry (A-level only) Questions
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3.4 Trigonometry (A-level only)
