$6xy+3xy+xy-xy^2$

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

$5\left(3x-1\right)>2\left(4x-7\right)$

$6x^3y^4z^2\::\:3x^2y^2z^2$

$\left(x-2\right)^2=36$

$\lim_{x\to0}\left(\frac{2e^{-6s}}{s}-\frac{2e^{-8s}}{s}\right)$

$2+2cos\left(x\right)=2csc\left(x\right)\left(1+cos\left(x\right)sin\left(x\right)\right)$