My Math Forum Tricky Spherical coordinates...

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July 7th, 2017, 06:07 PM   #1
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Tricky Spherical coordinates...

Consider the region S inside the cylinder x^2+y^2 = 1, outside the sphere x^2+y^2+z^2 = 1, and with z between 0 and 1. A view from above and a cross section (looking along the positive x axis) are shown below.

Set up one or more triple integrals to integrate a function f(x; y; z) over S using spherical coordinates, but DO NOT EVALUATE.
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 July 7th, 2017, 06:09 PM #2 Senior Member   Joined: Jan 2017 From: Toronto Posts: 200 Thanks: 2 Answer: $\displaystyle \int_{0}^{2 \pi} \int_{0}^{\pi / 4} \int_{1}^{sec \phi } \rho^2 sin \phi d \rho d \phi d \theta + \int_{0}^{2 \pi} \int_{\pi / 4}^{\pi / 2} \int_{1}^{csc \phi } \rho^2 sin \phi d \rho d \phi d \theta$ I guess I don't understand why the first time inner upper limit is $\displaystyle sec \phi$ while the second term inner upper limit is $\displaystyle csc \phi$ Last edited by zollen; July 7th, 2017 at 06:11 PM.
 July 8th, 2017, 04:07 PM #3 Senior Member   Joined: Jan 2017 From: Toronto Posts: 200 Thanks: 2 Both terms upper limits should have been $\displaystyle sec \phi$. I don't understand why the second term upper limit is $\displaystyle csc \phi$

 Tags coordinates, sphereical, spherical, tricky

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