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**[SOLVED] Changing limits of integration**

**1. Homework Statement**

Given:

[tex]\int_{y=0}^\pi\int_{x= y}^{\pi}\frac{sinx}{x} dxdy[/tex]

Change the order of integration and evaluate the double integral.

**2. Homework Equations**

My professor told me, "This integral cannot be expressed in terms of elementary functions". I'm not exactly sure what that means.

**3. The Attempt at a Solution**

sinx/x has always been a very common problem for differentiation and integration, so I'm confident I can solve this with a simple substitution. I'm trying to figure out, however, what they mean by not being able to be expressed in terms of "elementary functions".