$\left(y^{-1}+y^{-2}\right)\left(6y^{-3}-8y^{-4}\right)$

$m\:=\:\left(x\:+\:1\right)\:\left(x\:+\:2\right)\:+\:\left(x\:+\:5\right)\:\left(x\:-\:2\right)$

$\int\frac{6sin6t}{5-cos6t}dt$

$\left(30+12\right)\left(3^2-2^2\right)$

$\frac{dy}{dx}=2x-y+7$

$\frac{3k\left(k+1\right)+6\left(k+1\right)}{2}$

$\left(5m-7\right)\left(m+2\right)$