Find the volume of the solid generated when the region bounded by $y=13sinx$ and $y=0,$ for $0x,$ is revolved about the $x-$axis. $($Recall that $si{n}^{2}x=\frac{1}{2}(1-cos2x).)$

Set up the integral that gives the volume of the solid.

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$($Type exact answers.$)$