$3n\left(n+2\right)$
$\left(a-b\right)\left(x-4\right)$
$9x^2+50x+25$
$\frac{dy}{dx}=\frac{9x^2-sin\left(x\right)}{cos\left(y\right)+5e^y}$
$y\ln\left(x\right)\frac{dy}{dx}=\left(\frac{y+2}{x}\right)^2$
$9x^2+15x^3$
$3xy+6y+8y+3z$
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