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1. The problem statement, all variables and given/known data

I am given a line integral:

[tex]\int (x^2+y^2)^2ds[/tex], where C is a circle of radius 3 with centre in (0;0).

Evaluate it.

3. The attempt at a solution

Ok, first I know [tex](x^2+y^2)^2[/tex] = [tex]81[/tex]. So far, so good.

Then I know for an object in the xy-plane, ds = r*dr*d[tex]\theta[/tex]. I just insert and use the correct limits, and do the integral?

Thanks in advance.

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# Homework Help: Evaluating line integrals

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