$x'=\frac{x^2y^2}{1+x}$

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

$-\left(-14+15-9\right)-\left(-20-6+30\right)+\left(-6+10-3\right)$

$\left(\frac{1m^2}{2}-\frac{2}{m^2}\right)^2$

$x^2-2x-168$

$\frac{d}{dx}\left(\frac{sin^6xtan^4x}{\left(x^2+3\right)^2}\right)$

$10+\:-9\:+\:\frac{-90}{5}$