$\:5x^0y^0$
$\frac{dy}{dx}+\frac{3y}{x}=7x+3$
$12x^3y^2-7y^3$
$3x+1\:entre\:2x-4$
$\frac{\sin a+\tan a}{\sec a+1}$
$\frac{-x^2-2x+2}{x^2-1}$
$\lim_{x\to0}\ln\left(x\right)$
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