$15\:-\:2\:+\:\left(-\:23\right)\:-\:\left(\:+\:2\:\right)\:-\:\left(\:-\:10\right)\:$
$\frac{729-512m^3}{9-8m}$
$sen\:a\cdot\:cos\:a=1$
$\left(4c^2\cdot2c^2\cdot c\right)^3$
$\lim_{x\to1}\left|x\right|$
$\left(-37\right)-\left(-50\right)$
$\left(x+\sqrt{3}\right)\left(x+2\sqrt{3}\right)$
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