$\left(\sqrt{x+3}\right)+\left(\sqrt{x+3}\right)+\left(\sqrt{x+3}\right)$
$2\sqrt{51x}$
$5^{x+3}+5^{x+2}+5^{x+1}=0$
$6x^2+5x-11$
$\sec\left(\arctan\left(\frac{4}{x}\right)\right)$
$\lim_{x\to2}\left(\frac{2x-3}{x-1}\right)$
$x^2+16x+55=0$
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