Mathematics 9709 · AS & A Level · Integration

Integration — practice question

The diagram displays a section of the curve with equation $y = 4\sin^2 x + 8\sin x + 3$ and the point of intersection $P$ on the $x$-axis.
(i)[3]

Determine the exact $x$-coordinate of $P$.

(ii)[6]

Show that the curve’s equation may be expressed as $y = 5 + 8\sin x - 2\cos 2x$, then use integration to determine the exact area of the shaded region bounded by the curve and the axes.

Worked solution & mark scheme

This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: Solve the three-term quadratic equation for $\sin x$.

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