$\left(\frac{2}{3}x^3y^3\right)dy+\left(\frac{1}{2}x^2y^4\right)dx=0$
$3z^2=108$
$32x^2y-50y$
$\frac{x^3+6x^3-12x-9}{x+3}$
$\frac{1-\text{sen}^2x}{\cos x}\equiv\sec x+\cos x$
$-2=2x^2-5x$
$4896:-56$
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