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将 y = sin(x^2) 在 [0, pi] 上绕y轴旋转（壳）。（提示：代换 u = x^2 。）
将 y = sin(x^2) 在 [0, pi] 上绕y轴旋转（壳）。（提示：代换 u = x^2 。）
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