Transforming a Double Integral to a Single Integral

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Homework Help Overview

The discussion revolves around transforming a double integral into a single integral using polar coordinates. The specific integral involves the expression \(\sqrt{1+(x^{2}+y^{2})^{2}\) over the region defined by \(x^2 + y^2 = 4\) in the first quadrant.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the transformation of the double integral and the limits of integration. There is an attempt to confirm the correctness of the integral expression derived in polar coordinates.

Discussion Status

Some participants have provided feedback on the correctness of the integral transformation, while others express concerns about the evaluation of the integral. There is acknowledgment of the need for clarity in the working steps, but no consensus on the evaluation method has been reached.

Contextual Notes

Participants are considering the specific limits of integration based on the defined region in the first quadrant, which may influence the setup of the integral.

gikiian
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Homework Statement



Use polar coordinates to change the following double integral to a single integral involving only the variable r.

Double-Integral( [tex]\sqrt{1+(x^{2}+y^{2})^{2}[/tex] )

The x-y region is x^2 + y^2 = 4 in the first quadrant.

2. The attempt at a solution
I got upto this:
Integral(pi/2 sqrt.(1+r^4) r dr)

Did I do it right?
 
Last edited:
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hi gikiian! :smile:

what are the given limits of integration in the question? :confused:
 


The x-y region is x^2 + y^2 = 4 in the first quadrant. Thanks for reminding :)
 
gikiian said:
The x-y region is x^2 + y^2 = 4 in the first quadrant.

ah, thought so! :biggrin:

in that case, yes your integral is correct

(though showing a bit of working might have been a good idea :wink:)
 


Hmm, thanks. Next time for sure :)

Now, evaluating the integral is a headache! :frown:
 
(have a square-root: √ and try using the X2 tag just above the Reply box :wink:)

try the simplest possible substitution :smile:
 

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