$\frac{dy}{dx}+\frac{2}{x}+x^2=sen2x$
$-27.\left(-2\right)$
$\left(x+a\right)\left(x\right)$
$3x^2-47x+14$
$-w^2-16w+36$
$-x^2=-3x-18$
$\left(x^2-7\right)\cdot\left(2x^3+10x^2-4\right)$
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