Mathematics 9709 · AS & A Level · Trigonometry

Trigonometry — practice question

Assume that $\theta$ is an acute angle, measured in degrees, with $\sin \theta = \frac{2}{3}$.
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Determine the exact value of $\sin(\theta + 60^\circ)$.

Worked solution & mark scheme

This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “State or imply that $\cos\theta = \frac{\sqrt{5}}{3}$” …

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