$\frac{x^3-3x^2-9x-18}{x^2-9}$
$\sqrt{6-9x^2}$
$\int\frac{-9x^2-82x-18}{x+9}dx$
$\left(1+2cosx+cos^2x\right)^2$
$\lim_{x\to0}\left(\frac{sec^2x}{cosx}\right)$
$\cos^2=0.9$
$4-6-7\cdot1$
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