MathJax is rendering twice - mathjax

Question

I have a MathJax demo that can be viewed at Online Demo.
In this demo, I have some Tex markup within a div that gets rendered perfectly by MathJax.
But, if I programatically add some Tex markup to the above div by clicking Add Math Markup button followed by clicking Rerender Math Markup button, then it results in repeated rendering of previously rendered Math markup. This can be seen in following video: Math being rendered repeatedly
All I am doing when Rerender Math Markup button is clicked is calling the following method MathJax.Hub.Typset(divElement). The divElement is the div to which Tex markup was added programatically.
Demo code for my situation
<script>
function reRenderMath() {
var div = document.getElementById("mathMarkup");
//render Math for newly added Tex markup
MathJax.Hub.Typeset(div);
}
function addMath() {
var div = document.getElementById("mathMarkup");
div.innerHTML = div.innerHTML + "$$\sin^{-1}.6$$";
document.getElementById("btnRenderMath").disabled = false;
}
</script>
<script type="text/x-mathjax-config">
MathJax.Hub.Config({tex2jax: {inlineMath: [['$','$'], ['\\(','\\)']]}});
</script>
<script type="text/javascript"
src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
<button type="button" onclick="addMath();return false;" id="btnAddMath" >Add Math Markup</button>
<button type="button" onclick="reRenderMath();return false;" id="btnRenderMath" disabled>Rerender Math Markup</button>
<div id="mathMarkup">
$$x^2 = x +2$$
</div>
Screen shot of repeated rendering

Answer 1

#Sunil thanks for the answer
Summarizing:
Required script:
var MathJaxUtils = (function () {
let obj = {};
let scripts = null;
obj.render = function (element) {
scripts = new Array();
$(element).find("script[id^='MathJax-Element']").each(function () {
scripts.push({
displayElement: $(this).prev("div")[0],
scriptElement: this
});
});
//remove all html within MathJax script tags so it doesn't get typset again when Typeset method is called
$(element).find("script[id^='MathJax-Element']").remove();
//render Math using original MathJax API and in callback re-insert the MathJax script elements in their original positions
MathJax.Hub.Queue(["Typeset", MathJax.Hub, element, typeSetDone]);
};
//callback for Typeset method
function typeSetDone() {
for (var i = 0; i < scripts.length; i++) {
$(scripts[i].displayElement).after(scripts[i].scriptElement);
}
//reset scripts variable
scripts = [];
};
return obj;
}());
Basic use:
let elem = document.getElementById("mathContainer");
MathJaxUtils.render(elem);
Demo:
math-jax-test