$\left(3x-4xy+7x^2y+5xy\right)+\left(-8x-2xy-6x^2y+9xy^2\right)$
$-3-\left(-12\right)$
$3\:sen^2x=1$
$3\cdot sin\left(2x\right)=3\cdot cos\left(x\right)$
$5x-\:4y\:-3y$
$x\frac{dy}{dx}=\frac{2x}{3y^2}$
$\int\frac{5x^2+10x+1}{\left(x+1\right)^2\left(x-1\right)}dx$
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