$-\left(-7\right)\cdot\left(-5\right)\cdot\left(-3\right)\cdot\left(-2\right)$
$\left(\frac{5}{7}m^2-\frac{1}{2}m+2\right)^2$
$\lim_{x\to0}\left(\frac{-1}{x+\left(1-x\right)^2}\right)$
$8x-3x-4x+x$
$\left(+9\right)\:-\:\left(-16\right)$
$\sec=\sin\left(\tan+\cot\right)$
$5-\left(0.8+0.5\right)$
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