Use the disk method to find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis.y=1+x21,y=0,x=−1,x=1
Q. Use the disk method to find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the x-axis.y=1+x21,y=0,x=−1,x=1
Set up integral: Set up the integral for the volume using the disk method.The volume V of a solid of revolution generated by revolving a region about the x-axis can be found using the formula:V=π∫ab[f(x)]2dxwhere f(x) is the function that defines the upper boundary of the region being revolved, and a and b are the limits of integration along the x-axis.For the given problem, f(x)=1+x21, a=−1, and b=1.So, the integral to find the volume is:V=π∫−11(1+x21)2dx
Simplify integrand: Simplify the integrand before integrating.The integrand simplifies to:(1+x21)2=1+x21So the integral becomes:V=π∫−111+x21dx
Integrate function: Integrate the function.The integral of 1+x21 is arctan(x), so we have:V=π[arctan(x)]−11
Evaluate integral: Evaluate the integral from a=−1 to b=1.V=π[arctan(1)−arctan(−1)]Since arctan(1)=4π and arctan(−1)=−4π, we have:V=π[4π−(−4π)]V=π[4π+4π]V=π[2π]V=2π2
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