$\frac{\left(15x^2y^{-3}\right)^{-2}z^{-3}}{5x^2y^{-3}z^6}$

$\lim_{x\to2}\left(\frac{\cos\left(x-\frac{\pi}{2}-2\right)}{ln\left(x-1\right)}\right)$

$\left|1\:\right|$

$\lim_{x\to\infty}\left(\frac{ln\left|b-2\right|}{ln\left|b+1\right|}\right)$

$\lim_{x\to0}\left(\frac{9-3\sin\left(3x\right)}{5x^3}\right)$

$-3-5+2-11-7+4$

$16x^4-1$