Question: Display of variable in Equation editor-does not put in HTML, ex: "Pi"

I am trying to display multiple integrals with the equation editor in my questions. If I use the name $eqn, for example, it does not put that in HTML format. It may leave it: x^2 +y^3. I have tried putting my variable into HTML in the algorithm but then it will not display at all. Any suggestions? I have avoided the editor as much as possible but it is impossible with definate integrals.
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