$9-3x+2x\left(6x-2\right)+\left(4x+1\right)\left(2x-1\right)$

$x^2-x+56$

$-\frac{\ln\:\left(x\right)}{x+1}+\ln\:\left(\frac{\left|x\right|}{\left|x+1\right|}\right)$

$\lim_{x\to\infty}\left(\frac{x+1}{k}\right)$

$b=\frac{2\cos^{3}x-\cos x}{\senx-2\sen^{3}x}$

$-\left(281\:+541\right)\:-\:\left(-94\:-903\right)\:+\:\left(430\:+44\right)\:+\:\left(-1005\:-201\right)$

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