$\sqrt{5x^2}$
$\cos^2x\:-\:3\sin^2=0$
$49b+21$
$19-\left(-1\right)$
$2x+7x+x-8x$
$\left(b+8\right)\left(b-55\right)$
$\lim\:_{x\to\:\:1}\left(\frac{x^2-1+in\left(x\right)}{e^3-e}\right)$
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