Mathematics 9709 · AS & A Level · Trigonometry

Trigonometry — practice question

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Solve the equation $2\cos 2\theta = 4\cos \theta - 3$, taking $0^\circ \le \theta \le 180^\circ$.

Worked solution & mark scheme

This 4-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Make suitable use of the $\cos 2\theta$ identity” …

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