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Reference Rendering division in HTML
This is how we use exponents and Superscript in Mathjax
$$v(t)= ( 1-e^{-\frac{t}{RC}}).V $$
Notice that you need to include the whole thing in curly bracket. Notice that this one does not include everything in the superscript
$$e^-\frac{t}{RC} $$
And this one does
$$e^{-\frac{t}{RC}} $$