$\left(3\right)^2-2\left(3\right)+1$
$208-100+216-183$
$4-11\:\:\:3-8$
$\ln\sin\frac{\pi}{3}$
$18x^5+3x^4$
$-\left(3x^{2}+5x+1\right)$
$\lim_{x\to0}\left(\frac{e^{7x}-1}{cosx}\right)$
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