$\frac{x^3-7x-6}{x+2}$

$\left(xy-4y\right)\left(x-2y\right)$

$\left(-11x^6y^2\right)\left(-5mxy^7\right)$

$9-6\left(x-y\right)+\left(x+y\right)^2$

$\lim_{x\to0}\left(\frac{\ln\left(1+x^2\right)-\cos\left(x\right)}{\ln\left(1+x\right)+\ln\left(1-x\right)}\right)$

$\cos^2x-0.5$

$\frac{m^5-32}{m+2}$