$\lim_{x\to\infty}x\ln\left(\frac{x+1}{x}\right)$
$\frac{d^2}{dx^2}\left(3t^2-t\right)$
$\left(2+2i\right)+\:\left(2+5i\right)$
$\left(\:a-3b\right)^2$
$\frac{dy}{dx}=\frac{xy-2x-y+2}{xy-3x+3y-9}$
$\left(a+3c-f\right)^2$
$\left(15cm\right)^2-\left(17cm\right)^2$
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