$3m-6+m^2-5m+1$
$\frac{sen\:z\:}{1+cos\:z}+\frac{1+cos\:z}{sen\:z}=2cs$
$\lim_{x\to3}\left(\frac{x^3+27}{x^2+9}\right)$
$x^2-2x-5>3$
$\frac{1}{2}x^4-3x^2$
$\frac{dy}{dx}=-4y^2$
$\int\left(\csc^3\left(4t\right)\right)dt$
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