The inline \(\sqrt{x^2-1}\) equation.
There must be no blanks after the opener and before the closer. This makes so you can donate $5 or $10 dollars here and there without problem.
There is no such think as nesting \(\sqrt{x^2-1}\)+3\(+3\). As usual delimiters can be $escaped$ \(\sqrt{16\$}\)
Amazing, this is hyperlinked math \(3x^2\)
The HTML renderer should be careful with \(a < b\) escapes.
Display math can be in math code blocks.
But it can also be in \[ \left( \sum_{k=1}^n a_k b_k \right)^2 < \Phi \]