$\lim_{x\to\infty}\left(\frac{x-x^2}{2-3x+x^2}\right)$
$7x\left(x+5\right)^2$
$\int\frac{\cos\left(\frac{1}{x}\right)}{2x^2}dx$
$\frac{dy}{dx}yx+y^2+5xy^2=0$
$x+10=100$
$2^6\cdot7^6$
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