Under construction (no kidding huh?)
1. You need to install the cookbook for jsmath for pmwiki. See here.
2. You will get a icon for jsmath on your shortcuts bar: About the icon.
The icon is position number 1000 so it usually appears at the end.
The instruction for it is in the jsMath.php cookbook and not in config.php like other added icons.

Samples and how to get them ...
Sample  Code 
\mathop = \limits^?  \mathop = \limits^?

Basic math: f(x)=\sqrt{x}+\frac{x}{3}
Code:
{$ f(x)=\sqrt{x}+\frac{x}{3} $}

The formula is: \bbox[border:2px green dotted,2pt]{x_{1,2} = {{  b \,\pm\, \sqrt {b^2 \,\, 4 \cdot a \cdot c} } \over {2 \cdot a}}}
Code:
{$ \bbox[border:2px green dotted,2pt]{x_{1,2} = {{  b \,\pm\, \sqrt {b^2 \,\, 4 \cdot a \cdot c} } \over {2 \cdot a}}} $}
(You can increase the size of the font in pmwiki so that the whole thing is bigger.) 
Linear system: \left\{ \begin{array}{c} \,\,x + 2y = 3 \\ 3x  2y = 1 \\ \end{array} \right.
Code:
{$ \left\{ \begin{array}{c} \,\,x + 2y = 3 \\ 3x  2y = 1 \\ \end{array} \right. $}
Notice the "period" after \right  You must have the \right command, but the "period" makes it empty!

Colors: \color{purple}{x\mathop = \limits^?1} and \color{teal}{y\mathop = \limits^?2}
Code:
{$ \color{purple}{x \mathop = \limits^? 1} $} and {$ \color{teal}{y \mathop = \limits^? 2}
Visible colors: red, green, purple, blue, teal, darkgreen, darkgrey, darkorange, yellowgreen

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