$-15-4+12-3-11-2$
$\left(10a^2\:+\:4b\right)\:\left(10a^2-\:4b\right)$
$\frac{d}{dx}\left(wx\sin\left(y\right)-2x^2\sin\left(y\right)+x^2\sin\left(y\right)\cos\left(y\right)\right)$
$sen\theta-tg\theta\:.sen\theta\:=cos\theta\:$
$\left(7x+6\right)\left(2x\right)$
$12x^2+24x+9$
$ln\:\sqrt{\frac{ab^3}{c^2}}$
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