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How to evaluate the following integral? $$\iint \exp\left(\sqrt{x^2+y^2} \right)\:dx\:dy$$

I'm trying to integrate this using substitution and integration by parts but I keep getting stuck.

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    integration...*over what*?2012-11-04
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    This is tagged [tag:indefinite-integral]. What do you mean by an indefinite *double* integral? Do you really want a definite integral? If so, what would be its domain?2013-11-25

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