$6z^2-12z$
$a\cdot b=24$
$\frac{d}{dx}\left(\frac{1}{15}y\left(1-\frac{y}{100}\right)\right)$
$\frac{x\left(1-cosx\right)}{x-sinx}$
$\left(x^4-3x^3-9x^2\right)^5.\left(x-1\right)$
$\frac{3x^2+x+12}{x^3-5x^2+4}$
$-3b^2-2b^2$
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