Mathpix (no relation)
Take a photo of
a handwritten math problem
and get
the LaTeX code from your smartphone (or computer)
Take a photo on the iPhone, and crop it.
Submit and voilá.
![\begin{equation} \[ \therefore R_{1}=\left(\frac{q a}{2}\right)\left[2-\alpha^{2}(1+\beta)\right] \end{equation} \]](https://www.mathpax.com/wp-content/ql-cache/quicklatex.com-208fe8c27ea230726c00b289eb0771fd_l3.png "Rendered by QuickLaTeX.com")
\begin{equation}
\[
\therefore R_{1}=\left(\frac{q a}{2}\right)\left[2-\alpha^{2}(1+\beta)\right] \end{equation}
\]
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