Solving a quadruple integral of view factor

I'm solving an analytical quadruple integral in Mathematica, but the app can't solve it. I don't know if it is because that I do a bad formulation of the integral or maybe, Mathematica is not able to do this.

I divided the quadruple integral into two double integrals. So actually, Mathematica solves the first double integral, but when I put the result into the second, the app doesn't solve it.

I don't know how to write the integrals here, that's why I attached a photo.

• I have tried indefinite integral with Integrate and the 3rd-party RubiInt, both of which are successful. – Αλέξανδρος Ζεγγ Jul 31 at 6:54
• You do not need actually the 4-integral. The 2-integral you typed is sufficient. Just do the substitution $a=x-u$, $b=x+u$ in the original integral. The integration over $b$ is trivial. Analogically you do with $y$ and $v$ variables. – yarchik Jul 31 at 7:34
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• Thank you for the answers. I'm running with Rubi, but I'm not having good luck. I'm new in mathematica. On the other hand, I don't understand the cv that you made it, you mean in the 4-integral? – Mijail Aug 1 at 4:52