\section{Mathematical Formulas}

You can see the power of \LaTeX when you have to type a complicated formula:
\[ \sum_{i=1}^{n} \frac{a^i}{b^i} + \frac{c_i}{d^i} \]

Here's how they look when displayed:
\[\sum_{i=1}^{n} x_{i} = \int_{0}^{1} f\]
and in the text:
\(\sum_{i=1}^{n} x_{i} = \int_{0}^{1} f\).