This is an input

  1. $$\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$$

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

Another example

  1. \begin{equation}\int_{0}^{1}\sqrt{x}dx=?\label{eq1}\end{equation}

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

  1. \ref{eq1}

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

Now let see inline equations

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

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

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