$-\:9\left(x+1\right)\left(x+2\right)\:$
$\frac{-x}{\sqrt{-x}}$
$2\cos^2\left(x\right)-\cos\left(x-1\right)$
$x^2+16x+121$
$\frac{dy}{dx}=x^3+x^2-x-e^{\left(x-2\right)}x=3$
$\int\frac{x+4}{x^2-5x+6}dx$
$4x^2+4x-27\ge0$
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