$\lim_{x\to0}\left(\frac{2}{x^2}-\frac{1}{x}\right)$
$4x^2+28x-32$
$- 2 x ^ { 3 } \psi ^ { 3 } + x \varphi$
$\frac{dn}{dt}+n\:=nte^{t-2}$
$\lim_{x\to2}\:\sin\left(x-2\right)^{x-2}$
$\frac{dy}{dx}+2x-1=0$
$\lim_{x\to1}\frac{3x}{\sqrt{x-1}}$
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