$1-4+9+5-3-7$
$2sen\:=1$
$\frac{-4x^{10}}{-7xy^2}$
$\frac{dy}{dx}=-\left(y-2\right)-\frac{1}{4}\left(y-2\right)^2$
$\left(5\tan10+10\cot80\right)\tan80$
$\left(8n-3\right)\left(n-8=0\right)$
$-b^2+ab^2$
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