$\int\frac{x^3}{\left(3+x^4\right)^5}dx$

$\frac{32p^{5}q^{6}}{-8p^{3}q^{2}}$

$\lim\:_{x\to\:\infty\:\:}\frac{\left(\sqrt{2x^2+x}+2x-3\right)}{\left(\sqrt{9x^2+2x+1}\right)}$

$36v^2-72$

$\frac{32\times5+243x^{5}}{2x+3y}$

$1241\cdot67$

$\int\frac{x^2}{\left(x+1\right)\left(x^2-2x+2\right)}dx$