Triple integral and Change of Variables

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SUMMARY

The discussion focuses on evaluating the triple integral ∫∫∫cos((35x^2 + 21y^2 + 15z^2)^(3/2))dV over the solid region W defined by the ellipsoid x^2/3 + y^2/5 + z^2/7 = 1. Participants suggest converting the integral to spherical coordinates to simplify the evaluation process. However, challenges arise in managing the cosine function within the integral, indicating the need for a strategic approach to change of variables effectively.

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Homework Statement


The solid region W is bounded by the ellipsoid x^2/3 + y^2/5 + z^2/7 = 1. Find the triple integral ∫∫∫cos((35x^2 + 21y^2 + 15z^2)^(3/2))dV.


Homework Equations



Domain: x^2/3 + y^2/5 + z^2/7 = 1

Integral: ∫∫∫cos((35x^2 + 21y^2 + 15z^2)^(3/2))dV

The Attempt at a Solution



I converted the integral to spherical but after that, I do not know where to go. I cannot get rid of the cosine and the whole equation just seems extremely complex.
 
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I converted the integral to spherical
How did you do that? If done in a clever way, I think the problem gets a lot simpler.

Your domain should have ##\leq 1##.
 

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