\[x \frac{z}{tx}e\]
\[x \frac{z}{(t+x)}e\]
\[x ( \frac{z}{t} )^2_3e\]
\[x \frac{z}{(t+x)}e\]
\[x \frac{zy^2}{a}b\frac{c}{df^3}e\]
\[x \frac{xf}{\frac{a}{b}}e\]
\[x_{23x^2y}y^3 \sin x \frac{x^2}{yx_3} \sqrt[3]{x}\]
\[
\Re{z} =\frac{n\pi \dfrac{\theta +\psi}{2}}{
\left(\dfrac{\theta +\psi}{2}\right)^2 + \left( \dfrac{1}{2}
\log \left\lvert\dfrac{B}{A}\right\rvert\right)^2}.
\]
\[
\cfrac{1}{\sqrt{2}+
\cfrac{1}{\sqrt{2}+
\cfrac{1}{\sqrt{2}+\dotsb
}}}
\]