9231 P22 - Nov 2020 - Q2 - 6 marks
6064
A curve has equation \(y=\cosh x\), for \(0 \leqslant x \leqslant \frac{1}{2}\).
Find, in terms of \(\pi\) and e , the area of the surface generated when the curve is rotated through \(2 \pi\) radians about the \(x\)-axis.
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