Test

Test

$E=mc^{2}$

Failed to parse (syntax error): {\displaystyle <mi>π<!-- p --></mi> <mo>⁢<!-- &InvisibleTimes; --></mo> <msup> <mi>r</mi> <mn>2</mn> </msup> }

$$\mathrm{\pi <!--\; p\; -->}<!--\; \; -->r^2$$