$\frac{\left|-\frac{40}{\left(-2\right)}\right|}{2^2}$

$\frac{\left(\sec^2x+\csc^2x\right)}{\sec^2x}=\csc^2x$

$\int\frac{-9x-9}{x\left(x+1\right)}dx$

$\lim_{x\to4}\left(\frac{\left(6\sqrt{2}-2\right)}{3x-12}\right)$

$\lim_{x\to-1}\left(x^{4\:}-x^3+x^{2\:}-x-1\right)$

$-3+4y-5x+6y$

$\frac{x^2}{x+3}\ge2$