$\int_0^3\left(\frac{1}{\sqrt{1-x^2}}\right)dx$
$x^2+4x+20.25$
$\left(3mn-6\right)\cdot\left(3mn+6\right)$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{7x}\right)$
$\left(e^{2x}+1\right)^2$
$2\:-\:7\:-\:5\:+\:3\:+6\:$
$1^23$
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