Triple Integral with Spherical Coordinates

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Homework Help Overview

The problem involves evaluating a triple integral using spherical coordinates over a specified boundary, which is a ball of radius 2 centered at the origin. The integrand includes a square root expression that complicates the substitution process.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the challenges of substituting Cartesian coordinates into spherical coordinates, particularly focusing on the integrand. There is an emphasis on the complexity of the resulting expression and the difficulty in simplifying it. One participant mentions the need to maintain the identity involving sine and cosine during the substitution process.

Discussion Status

The discussion is ongoing, with participants attempting to clarify their substitutions and seeking assistance in simplifying the integrand. There is no explicit consensus yet, but guidance has been offered regarding trigonometric identities that may aid in the simplification process.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the information they can share or the methods they can use. The complexity of the integrand and the spherical coordinate transformations are central to the discussion.

veritaserum
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Homework Statement


Evaluate \int\int\int 1/\sqrt{x^{2}+y^{2}+z^{2}+3} over boundary B, where B is the ball of radius 2 centered at the origin.


Homework Equations


Using spherical coordinates:
x=psin\Phicos\Theta
y=psin\Phisin\Theta
z=pcos\Phi

Integral limits:
dp - [0,2]
d\Phi - [0,\pi]
d\Theta - [0,2\pi]

The Attempt at a Solution


I am just having trouble finding a good substitution for the integrand. When I substitute x,y, and z with the spherical substitutions, I just get a huge jumbled mess that I can't make any sense of.
 
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whoops sorry, the integrand should be
\frac{dV}{\sqrt{x^{2}+y^{2}+z^{2}+3}}
 
veritaserum said:
When I substitute x,y, and z with the spherical substitutions, I just get a huge jumbled mess that I can't make any sense of.

Show us. And keep in mind that \sin^2\eta+\cos^2\eta=1.
 
lol even trying to type that out is a huge jumbled mess in itself. i understand the property you gave me, it's just that i am not able to factor out enough terms such that i leave that identity intact.
 

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