##  Class files

This is the 15th video in a series of 21 by Dr Vincent Knight of Cardiff University. It's very easy in LaTeX to write an integral—for example, to write the integral of x-squared from zero to pi, we simply use: $$\int{0}^{\pi}x^2 \,dx$$ To try this for yourself, click here to open the 'Integrals' example.