This is standard LaTeX typesetting on WordPress:
\dfrac{e^x}{1 + e^x}
This is using the KaTeX plugin for WordPress:
\begin{aligned}
y &= \dfrac{e^x}{1 + e^x} \\
y & = \dfrac{a + b}{b}
\end{aligned}
sdf
Math
\begin{aligned}
y &= \dfrac{e^x}{1 + e^x} \
y & = \dfrac{a + b}{b}
\end{aligned}
\begin{aligned} n &= \frac{1}{\sin\ c} \\
&=\frac{1}{\sin\ 48.3^\circ} \end{aligned}
