need help with a triple integral in spherical coords

sjones11

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Jul 15, 2005
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R is the region enclosed by a sphere of radius 5 and the plane z=3.

Write an integral in spherical coordinates representing the volume of this region and evaluate it. (Would be much easier in cylindrical, but that is the problem before this one)

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Here's what I tried but it just doesn't seem right:

3/(cos(phi)) <= rho <= 5
0 <= phi <= cos^-1(3/5)
0 <= theta <= 2*pi

using I to represent the integral and the boundaries of integration as above,

III(rho^2)*sin(phi) d-rho d-phi d-theta

This is impossible to integrate and doesn't come out with a reasonable value plugged into my calculator, so I know I'm doing something wrong or overcomplicating this. Please help!
 
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