$dy\:+\:4xy^2dx=0$
$\lim_{x\to-\infty}xln\left(\frac{x}{1+x}\right)$
$1\frac{1}{x}$
$11x\:-\:20\:=\:6x\:+\:5$
$3x^2+18+81$
$\frac{d}{dx}\left(\left(x^4+1\right)^3\left(x-1\right)^4x^5\right)$
$2 ( x ^ { 5 } - x ^ { 6 } )$
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