$x\frac{dy}{dx}=x^3+4\cdot x^3y$
$\int9\:\ln\left(z\right)dz$
$\frac{2x+x^2}{x+3}$
$\frac{1+cos\left(2x\right)}{sen\left(x\right)}=cot\left(x\right)$
$\left(5\right)\left(\frac{150}{5}\right)$
$18x^2-3x-6$
$\frac{x^2+1}{x-3}$
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