Problem in rendering mathjax

I run Mathematicsly site using newspaper theme. The mathematics shown in
https://imgur.com/a/msS3u1e this image is rendered using the code “f(x)=\begin{cases} \frac{\sqrt{1+kx}-\sqrt{1-kx}}{x}, \text{if} \ -1\le x<0 \\ \frac{2x+1}{x-1}, \text{if} \ 0\le x<1 \end{cases}” which includes many backslashes. But problem is that your theme automatically remove backslashes. To overcome this I have included the following function code which is a temporary solution and I need to fix this permanentaly.
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function replace_backslashes_in_title($title) {
// Replace backslashes with the HTML entity ‘\’.
$title = str_replace(‘\\’, ‘\’, $title);

return $title;
}
add_filter(‘the_title’, ‘replace_backslashes_in_title’, 10, 2);
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Please help. Hope you understand my problem.

I do need solution from your side on this. Every time problem is just noted and ignored. I have many problems with your theme newspaper 12. Its been 10 days you are adding the problem in improvement list. Please solve these issues before I make and publish a video showing negative features and loopholes of newspaper theme on YouTube. Even I have many problems rather than this which I may convey after resolving this.
Thank you.
Regards.