$\frac{2x^2.}{x^2+9}$
$\frac{18w^2}{9w^5}$
$\left(x+23\right)\left(x-10\right)$
$\lim_{x\to\infty}\left(\frac{3+2x+6x^2}{8+4x-2x^2}\right)$
$4w-w^2$
$\lim_{x\to\infty}\left(\frac{\sin^2x}{x^2\cos x}\right)$
$y\frac{dx}{dy}+\left(y+1\right)x-e^y=0$
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