$\lim_{x\to2}\left(x^2-4x+3\right)$
$a2\:-\:1$
$x^2+6x+9=5$
$\left(c^2+f\right)^2$
$16-25x^2$
$\int\left(1+e^x\right)^{\left(\frac{1}{2}\right)}dy$
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