Show that $$\(3 \sin 2 \theta \cot \theta \equiv 6 \cos ^{2} \theta\)$$. ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................ ........................................................................................................................................................
Exam No：9709_s20_qp_23 Year：2020 Question No：8(a)
Answer:
Use at least one of \(\sin 2 \theta=2 \sin \theta \cos \theta\) and \(\cot \theta=\frac{\cos \theta}{\sin \theta}\)
Use both and conclude \(6 \cos ^{2} \theta\) AG
Use both and conclude \(6 \cos ^{2} \theta\) AG
Knowledge points:
2.3.2.1 more contents
2.3.2.2 the expansions of
2.3.2.3 the formulae for sin 2A,cos 2A and tan 2A
2.3.2.4 the expression of
Solution:
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