$\int\left(\frac{x}{\left(x^2+9\right)^2}\right)dx$

$\left(1+x\right)^3-\left(1-x\right)^3\le\:2x^3$

$\left(64-x^2\right)\frac{dy}{dx}=6y$

$\lim_{x\to\infty}\left(\frac{2x^2+3}{2x^2+5}\right)^{8x^2+3}$

$12+5m+m-8$

$\lim_{x\to\infty}\left(\frac{2x^2e^{3x}}{5+e^{3x}}\right)$

$3m-4m$