$x^2-4x+13=0\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$72\cdot40$
$\left(9-n^2\right)^2$
$\lim_{n\to\infty}\left(\left(ln\left(n+1\right)\right)^3\left(ln\left(n+1\right)+4\right)\right)$
$\left(2^a+x\right)^3$
$\lim169\left(\frac{1}{\sqrt{x}-13}-\frac{29}{x-169}\right)$
$2-3\sin^2x=3\cos^2x-1$
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