How to use alpha(α) symbol in LaTeX?

You need to use the \alpha command to print the alpha symbol in a latex document.

\documentclass{article}
\begin{document}
   \[ \sqrt{\alpha^2 + \beta^2} \]
   \[ \alpha_i > \beta_i \]
   \[ \frac{1}{x^{2\alpha}} \]
\end{document}

Output :