$px+mx+py+my$
$\frac{dy}{dx}=\left(\frac{xy\left(1-y\right)}{1+x}\right)$
$\left(k+1\right)\left(3k^2+12k+27\right)$
$\frac{xy+2x}{y+2}$
$3x^4\cdot x^0$
$4x^2+8x+1$
$8cot^2x+12cot\:x-8$
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