$$ \Delta = \frac{\partial U^*}{\partial F} = \frac{12F}{Eb} \int_0^L \frac{x^2}{(t_0 + \alpha x)^3} dx $$
Look at the SERVER SIDE souce (link below) to see the two script expressions and the double-dollar delimiters around the latex chunk.
markdown text file, as it is written.