$\lim_{x\to\infty}x-\sqrt{9x+x^2}$
$tan\left(\frac{\pi}{2}+\:x\right)=-cot\left(x\right)$
$xy^{-2}+x^{-1\:}$
$\frac{2x^4+4x^3-x^2}{x}$
$-7-5x=13-4x$
$\frac{dy}{dx}=2y+2$
$j3ejo$
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