Moodle in English: FlexTeX uses Google Chart API insted of mimeTeX

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followed by a TeX expression gives a png image of it.

https://chart.googleapis.com/chart?cht=tx&chl=\left%20\uparrow%20\frac{a}{b}%20\right%20\downarrow%20\quad%20\left

gives

$\left \uparrow \frac{a}{b} \right \downarrow \quad \left$

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