$\lim_{x\to\infty}\left(\frac{2x^6-2x^2+x-3}{x^3+2x^2-x+1}\right)$

$10a+1+9+4a-2a+a+2$

$\lim_{x\to4}\left(\frac{x^2-16}{4\sqrt{x}-8}\right)$

$xy^{-6}\:\left(\:x^6\:y^1-y^{-1}+x^{-6}\:y^{-4}-xy^{-6}\:z+3\right)$

$8x\:-\:9\:\le\:1$

$\int ln\left(x+4\right)dx$

$\left(x^2+1\right)^3\left(2x-5\right)^2$