2024 IGCSE Additional Mathematics October/November 0606/22 Q8

6 marks

Solve the equation \(\cot^2 2\theta+3\operatorname{cosec}2\theta=9\) for \(-90^\circ\leq\theta\leq90^\circ\).[6]

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Answer:\(-84.2^\circ,-5.8^\circ,15^\circ,75^\circ\).

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