$\frac{x^2-x-1}{x^2-x}$
$2x^2+8x\:+3=0$
$x^2-40x$
$\int x^2\sqrt{7-x}dx$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{1-sen\left(x\right)}{\left(\frac{\pi}{2}-x\right)^2}\right)$
$2\sec\left(x\right)+2$
$\frac{dy}{dx}\left(2+x^2\right)=\frac{x}{y}$
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