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3.4 Trigonometry (A-level only)
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Prove the identity:
cos2xcosx+sinx≡cosx−sinx \frac{\cos 2x}{\cos x + \sin x} \equiv \cos x - \sin x
cos
x
+
sin
x
cos
2
x
≡
cos
x
−
sin
x
[2]
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3.4 Trigonometry (A-level only) Questions
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3.4 Trigonometry (A-level only)
