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Solve $8\sin^2\theta + 6\cos\theta + 1 = 0$ for $0^\circ < \theta < 180^\circ$.
Mathematics 9709 · AS & A Level · Trigonometry
Trigonometry — practice question
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Rewrites as $8(1-\cos^2\theta)+6\cos\theta+1=0$ or an equivalent expression” …
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