$4ab-2a^2b+5-ab+ab^2+2a^2b$
$4z^2+24$
$x^2ex$
$x\frac{dy}{dx}+1=e^y$
$\lim_{x\to0}\left(\frac{\left(2e^x-2\right)}{x}\right)$
$\lim f\left(x\right)x>0$
$y=3x^{-2x}$
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