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Volume of the solid obtained by rotating the region bounded by the curves y=f(x) and y=g(x) and the lines x=a and x=b about the x axis is given by :`int_a^b pi [f(x)^2-g(x)^2]dx`
=`int_4^9pi[(x^2)^2-(sqrtx)^2]dx` ` `
`=11572.5*pi` cubic units.
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