$\int_{\frac{3}{\sqrt{3}}}^3\left(\frac{4}{x^2\sqrt{9+x^2}}\right)dx$

$6x^2+12x+144$

$9,3x^3-2y$

$\arctan\left(\frac{1+1}{1-1}\right)+\arctan\left(\frac{1-1}{2}\right)$

$-ydx+\left(x+xy\right)dy=0$

$\int\frac{\left(8e^x\right)}{\left(1\:+\:8e^x\right)}\:dx$

$y^2-y=x^2-x$