$\frac{\frac{-2\sin\left(x\right)}{\cos^2\left(x\right)}}{1-\frac{1}{\cos^2\left(x\right)}}$

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

$x-\left(1-x\right)^2$

$\sec x\tan x-5\csc^2x$

$5x+3y+4+2$

$\int\left(x\left(x+5\right)^7\right)dx$

$\int_0^2\left(\frac{1}{x\left(lnx\right)^2}\right)dx$