$-3-4\left(r-3\right)$

$\lim_{x\to1}\left(\frac{1-\cos\left(x-1\right)}{ln^2x}\right)$

$ln2x=101$

$\lim_{x\to0}\left(\frac{7+7x+3x^2-7e^x}{1-\cos\left(x\right)}\right)$

$\left(x+5\right)\left(5x-8\right)$

$\left(r^2-6\right)\left(r^2+6\right)$

$\ln\left(\frac{\cos x}{\cos x-1}\right)$