Mathematics 9709 · AS & A Level · Trigonometry

Trigonometry — practice question

(a(i))[4]

Solve $2\cos^2\theta = 3\sin\theta$ for $0^\circ \leq \theta \leq 360^\circ$.

(a(ii))[3]

For the equation $2\cos^2(n\theta) = 3\sin(n\theta)$, where $n$ is a positive integer, the smallest positive solution is $10^\circ$. State the value of $n$ and hence find the largest solution of this equation in the interval $0^\circ \leq \theta \leq 360^\circ$.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: Apply the correct identity to reach $2(1-\sin^2\theta)=3\sin\theta$

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