Question 1099224
*[illustration CK15.JPG].
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{{{V=int(pi*y^2, dx,x=0,pi/4)}}}
{{{V=pi*int(cos(2x),dx,x=0,pi/4)}}}
{{{V=pi*sin(x)cos(x)+C}}}
{{{V=pi/2}}}
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{{{I[x]=int(rho*x^2*cos(2x), dx,x=0,pi/4)}}}
{{{I[x]=rho*int(x^2*cos(2x), dx,x=0,pi/4)}}}
{{{I[x]=rho*((2x^2-1)sin(2x)+2xcos(2x))/4+C}}}
{{{I[x]=(rho/32)(pi^2-8)}}}