% Put the math symbols inside $...\$.

% \frac {}{} - fractions.

% \dfrac {}{} - show larger size of the numerator and denominator.

Syntax: \$ \frac {x^2}{x^3+x} = \frac {x^2}{x(x^2+1)} \$

Output:  $ \frac {x^2}{x^3+x} = \frac {x^2}{x(x^2+1)} $

Syntax:  \$ \dfrac {1}{x}+1=\frac {1}{x} \$

Output:  $ \dfrac {1}{x}+1=\frac {1}{x} $