$1^2-2\left(1\right)\left(2\right)+2^2$
$\frac{x^2-6x+7}{x-1}$
$x-3+4$
$\lim_{x\to\pi}\left(\frac{sin\left(2x\right)}{\pi-x}\right)$
$62+185+-300+500$
$2xy-x-y,\:x=2,\:0=1$
$\frac{\frac{d}{dx}\:\:\:\:\:\tan x}{\:\:\:\:\:\:ln\:x}$
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