$-2a-5>3$
$\frac{3}{5}.\sqrt{125m^6}$
$\left(2a+3\right)\left(3a+9\right)$
$\left(8x+9\right)+\left(8x-9\right)$
$k^2-9k$
$cos\left(x\right)\cdot\:\:sen\left(2x\right)=1+cos\left(2x\right)$
$\frac{x^2-9}{x^2-5x+6}\lim_{x\to0}\left(3\right)$
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