$\left(-6\right)-\left(-3\right)+\left(-2\right)-\left(-8\right)$
$\left(-60\right)\::\left(-20+15\right)$
$\left(x+2\right)\cdot\left(3x-9\right)$
$\frac{18x^{-4}}{5x^5}$
$\left(b-4\right)\left(b-3\right)\left[\frac{4}{b-4}-\frac{3}{b-3}\right]$
$\lim_{x\to0}\left(\frac{\left(2e^{2x}-2\right)^3}{3e^{x^2}-3x-3}\right)$
$tanx=\:\frac{1-cos\left(2x\right)}{sin\left(2x\right)}$
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