5
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What is

$$\int_0^1 \int_0^1 \frac{ dx \; dy}{1+xy+x^2y^2} ? $$

Can you do one of the integrals and turn it into a single integral? I get lost in a sea of inverse tangents.

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    Can you provide us your approach or at least your last step?2012-02-20
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    +1, and I wonder why I'm the only one who voted for this. I see questions where someone put a lot of work into a very good answer, that have zero votes in their favor. Should that happen? I never post an answer without up-voting the question.2012-02-20

3 Answers 3