\int \int \frac{3}{5}x + cx^{2}_{0} \, \sigma \pi^{2} dl d\theta ?
Yeah, what you do is you go to 'LATEX Equation Editor' (google that) and then put 'tex' brackets in between. So
[tex] then insert your maths stuff here copy and paste from the website after that put [/.tex], so the same thing...