$\:\frac{2x^{2\:}-x-3}{x+1}$
$\int_0^{\pi}sen\left(2x\right)\cdot sen\left(3x\right)dx$
$-4xy\:;\:\:\:y=-2$
$\frac{dy}{dx}=3x^2e^{-y},y\left(0\right)=1$
$\left(m^2-m+2\right)\left(m+2\right)$
$\left(-\frac{1}{8}x^2+2\right)^2$
$4x^2+19x+12$
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