$\frac{x-4x+3}{x-1}$
$y'=\left(x+1\right)y$
$\left(4a^2-36b^2\right)$
$\frac{x^3+x^2-x-3}{x^2-3}$
$\int2sen2t\:dt$
$\int\frac{x\left(x^2+1\right)}{\sqrt{x^2+1}}dx$
$\lim_{x\to2}\left(2x^2+x+10\right)$
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