Skip backslash escape in some blocks for Latex

[hegwin]

Hi!

I'm writing my blog with redcarpet to render Markdown and Ketax (a JS lib) to render Latex. Redcarpet comes first at backend, then Ketax renders after HTML is rendered

I met some issue for writing multiple line equations. For example:

I wrote this; The \\ means a line break in the formula:

\begin{align*}
  I_n &= \int_{0}^{\frac{\pi}{2}} \sin^n{x} dx \\
  &= \sin{x} \cdot \sin^{n-1}{x}
\end{align*}

Expected:

Actual: as \ is used to escape chars in redcarpet, the two \\ became one \, so it becomes

Workaround

In order to make it work, I have to use three \\\ or four \\\\ to make it render two \\:

\begin{align*}
  I_n &= \int_{0}^{\frac{\pi}{2}} \sin^n{x} dx \\\
  &= \sin{x} \cdot \sin^{n-1}{x}
\end{align*}

or

\begin{align*}
  I_n &= \int_{0}^{\frac{\pi}{2}} \sin^n{x} dx \\\\
  &= \sin{x} \cdot \sin^{n-1}{x}
\end{align*}

However, this is just a workaround; Because two \\ is standard in Latex, it works globally, I have to manually add extra \ to make it work together with redcarpet.

Question

1. Is it possible to stop \ escaping under some conditions: for example between \begin and \end?

2. Otherwise, I can use some extra symbols to isolate them. I can use $$$ to wrap all Latex thing like:

$$$
\begin{align*}
  I_n &= \int_{0}^{\frac{\pi}{2}} \sin^n{x} dx \\
  &= \sin{x} \cdot \sin^{n-1}{x}
\end{align*}
$$$

Is there any way I can make $$$ work like three ```s? Just wrap it with a <p> and keep everything as-is.