36-e^x2/1-e^36-x2

Your question makes my brain hurt.    

you need to use brackets and make your meaning clear.

How about using the home page calculator?

$${\mathtt{36}}{\mathtt{\,-\,}}{\frac{{{\mathtt{e}}}^{{\mathtt{x2}}}}{{\mathtt{1}}}}{\mathtt{\,-\,}}{{\mathtt{e}}}^{{\mathtt{36}}}{\mathtt{\,-\,}}{\mathtt{x2}} = {\mathtt{\,-\,}}{\mathtt{x2}}{\mathtt{\,-\,}}\left({{\mathtt{e}}}^{{\mathtt{x2}}}\right){\mathtt{\,-\,}}\left({{\mathtt{e}}}^{{\mathtt{36}}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{36}}$$