1. ## Double integral problem

Hey everyone, i'm having a hard time with this double integral here:
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I don't know how to work with the module part.

2. ## Re: Double integral problem

$|x-y| = \begin{cases}x-y & x\ge y \\ y-x & y\ge x\end{cases}$

So, you need to split up the integral:

$\displaystyle \int_0^1 \left( \int_0^x (x-y)dy + \int_x^1 (y-x)dy \right)dx$

Thank you