2021 YIJC P1 Q5

2021 YIJC P1 Q5

7 marks
Prelims

It is given that \(O\) is the origin and \(A\) is the point on the curve \(y=x{{\mathrm{e}}^{x}}\) where \(x=3\). The region bounded by the curve \(y=x{{\mathrm{e}}^{x}}\)and the line \(OA\) is rotated through \({{360}^{\circ }}\) about the \(x\)-axis. Find the exact volume of the solid formed.[7]

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Answer:\(\frac{\pi}{4}(23e^6 + 1)\) units\(^3\)

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