$\frac{-3x^3-6x^2+x+2}{x+1}$
$4-x^4$
$\int_1^{\infty}\left(\frac{1}{x^2\sqrt{x^2-1}}\right)dx$
$\left(\frac{5}{6}a+2b\right)\left(\frac{5}{6}a+2b\right)$
$\int\frac{\sin\left(4x\right)}{\cos\left(4x\right)+5}dx$
$\lim_{x\to+\infty}\left(18x^3-33x^2+20x-4\right)$
$\frac{dy}{dx}=\frac{2y}{x}+x^2cos\left(x\right)$
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