double integral problem



Hi everyone,

I have trouble in solving a double integral. Could anyone help me?

\int \int_{D} (sqrt(x^{2}+y^{2})) dxdy
the integral area D is : (x-d)^{2}+y^{2}=r^{2}

I can't get the simplist expression
of the double integral. Can anyone give me a hand?

Thanks in advance!

Haibo

.



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