$\left(3a-3b\right)\left(a+3b\right)$
$\lim_{x\to4}\left(\frac{2-\sqrt{x+1}}{5-\sqrt{8x+1}}\right)$
$6\left(3x-4\right)$
$\left(4x-2x^2\right)^2$
$\left(2x-9\right)\left(7x-1\right)$
$3.545\cdot2.41$
$\frac{dx}{dt}=\frac{tx}{1+t^2}$
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