$ctg^2x\left(1-cos2x\right)+sen^2x=2$
$\left(15+5x\right)-5x$
$5x+-17z\cdot4y$
$-\frac{200}{\left(17-7\right)}$
$x\frac{dy}{dx}+y=-x^2y^2$
$\left(\frac{3}{7}x+9y\right)\left(\frac{7}{2}x+6y\right)$
$\int\frac{\left(x^5\right)}{\left(1-x^2\right)^{\frac{2}{3}}}dx$
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