mathjax-test

This is h1

This is h2

This is h3

This is h4

From demo

When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are

Use $$...$$ (separate line)

Use \\[...\\] (separate line)

\[ \int_{-\infty}^{\infty} f(t) e^{-j\omega t} dt \]