$\frac{x-x^2+5x^3-4x^2}{-x^2-1}$
$x^2-6x-14$
$x^6\ln x-\frac{1}{3}x^3$
$x^2+2x=-1$
$\lim_{x\to\infty}\left(x\sqrt{2+\frac{1}{x}}-\left(\sqrt{2}x-3\right)\right)$
$821-312+27$
$\frac{dy}{y\left(\left(lny\right)^2+1\right)}=xdx$
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