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3.5 Trigonometry (A-level only)
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Question 4
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Markscheme
Prove the identity:
cos4Acos2A+sin2A≡cos2A−sin2A \frac{\cos 4A}{\cos 2A + \sin 2A} \equiv \cos 2A - \sin 2A
cos
2
A
+
sin
2
A
cos
4
A
≡
cos
2
A
−
sin
2
A
[2]
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3.5 Trigonometry (A-level only) Questions
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3.5 Trigonometry (A-level only)
