9709 P32 - Mar 2020 - Q5 - 7 marks
124
(a) Prove that \(\frac{\cos 3x}{\sin x} + \frac{\sin 3x}{\cos x} = 2 \cot 2x\).
(b) Solve the equation \(\frac{\cos 3x}{\sin x} + \frac{\sin 3x}{\cos x} = 4\) for \(0 < x < \pi\).
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