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Find all solutions of $\cos(\theta + 60^\circ) = 2\sin \theta$ in the interval $0^\circ \leq \theta \leq 360^\circ$.
Mathematics 9709 · AS & A Level · Trigonometry
Trigonometry — practice question
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Try using the $\cos(A+B)$ identity to produce an equation involving $\cos\theta$ and $\sin\theta$” …
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