$\left(a^3-6\right)\left(a^3+6\right)$

$\frac{d^2y}{dx^2}\left(x^{-1}-\frac{1}{5}x^6+\frac{1}{4}x^5-x^3\right)$

$3b^2\cdot4a^4$

$\frac{2x+8}{x-2}=-1$

$\:-\:\left[\:3\:-\:7\left(8\:-\:6\right)\right]\:-\:\left(7\:-\:1\right)\:+\:4\left[\:8\:-\:\left(4\:-\:3\right)\:-\:4\right]\:+\:7$

$\lim_{y\to3}\left(\frac{y^2+y-12}{x^2}\right)$

$x-\sqrt{2}>0$