4. (10%) Let Ω be a regioin (on the xy-plane) enclosed by , x=0 and y=e. Let S be the solid obtained by revolving Ω about the y-axis. Let V be the volume of S. V=_____
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, x=0 and y=e. Let S be the solid obtained by revolving Ω about the y-axis. Let V be the volume of S. V=_____