This is an input

Result \[\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\]

Another example

Result will be numbered equation like this \begin{equation}\int_{-\infty}^{+\infty}e^{-x^2/2}dx=?\label{eq2}\end{equation} Just type

to call equation, labeled eq1, like (\ref{eq2}).

Now let see inline equations

This \(\frac{x^2}{a^2}+\frac{y^2}{b^2}=1\) is inline equation.

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**PSPicture Example**

Another example