$\frac{dy}{dx}=\frac{2y^3+y}{x\left(1-y^2\right)}$
$\frac{dy}{dt}+y=0$
$a^2x^2-6ax+a$
$\left(4x^2-15x^3-40x\right)entre\:\left(x+2\right)$
$x^2+4y^2+9z^2=0$
$\lim_{x\to1}\left(\frac{\sqrt{x^2-x}}{\sqrt[3]{x^2+x-2}}\right)$
$25x^2-35x+49$
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