$\frac{dy}{dx}=-\frac{x^2+y^2+5x}{2xy}$
$\int-5x\cdot\cos\left(9x\right)dx$
$9\cdot4+6\cdot4$
$\left(5a+2a^3\right)^2$
$x^2-2x\:para\:x=-3$
$\int_3^{infinito}\left(t\cdot e^{-s\cdot t}\right)dx$
$\left(3x-1\right)^2-\left(4x+1\right)^2$
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