$\sin\left(x\right)+\cot\left(x\right)\cos\left(x\right)=2\sin\left(x\right)$

$\frac{6x^4+4x^3-2x-4}{x-9}$

$\lim_{g\to0}\left(\frac{e^{3g}-1}{\sin\left(g\right)}\right)$

$15k\:\:+\:\:8m\:\:-\:\:7k\:\:+\:\:2m$

$-5\cdot2+11$

$\lim_{x\to0}\left(\frac{x}{\cos\left(x\right)+x}\right)$

$\left(xb\right)^5\cdot a^4\cdot a^2$