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9709 P31 - Jun 2014 - Q8
1887

(i) By sketching each of the graphs \(y = \csc x\) and \(y = x(\pi - x)\) for \(0 < x < \pi\), show that the equation \(\csc x = x(\pi - x)\) has exactly two real roots in the interval \(0 < x < \pi\).

(ii) Show that the equation \(\csc x = x(\pi - x)\) can be written in the form \(x = \frac{1 + x^2 \sin x}{\pi \sin x}\).

(iii) The two real roots of the equation \(\csc x = x(\pi - x)\) in the interval \(0 < x < \pi\) are denoted by \(\alpha\) and \(\beta\), where \(\alpha < \beta\).

(a) Use the iterative formula \(x_{n+1} = \frac{1 + x_n^2 \sin x_n}{\pi \sin x_n}\) to find \(\alpha\) correct to 2 decimal places. Give the result of each iteration to 4 decimal places.

(b) Deduce the value of \(\beta\) correct to 2 decimal places.

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