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3.5 Trigonometry (A-level only)
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Question 3
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Prove the identity:
1−2sin2xcosx−sinx≡cosx+sinx \frac{1 - 2\sin^2 x}{\cos x - \sin x} \equiv \cos x + \sin x
cos
x
−
sin
x
1
−
2
sin
2
x
≡
cos
x
+
sin
x
[2]
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3.5 Trigonometry (A-level only) Questions
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3.5 Trigonometry (A-level only)
