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$x^3+y^3=9$
$\frac{4x^2-9y^2}{2x-3y}$
$\frac{dv}{dt}=-\frac{\sen^{2}u}{\cos^{2}t}$
$5x^2-30x+15$
$\left(4m^5\right)^3$
$-2x^3yz\left(3x^2y^2z^4-5x^3y^4z\right)$
$\frac{y^2+1}{y+1}$
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