$-1-\left(-8-9-13\right)+\left(-9-18-3\right)-14$

$\lim_{x\to1}\left(\frac{1-\cos\left(x-1\right)}{1-x\:\tan\left(x-1\right)}\right)$

$\frac{7x-2x^3-5}{x+2}$

$\tan\left(\tan\left(\frac{1}{2}\right)-\sin\left(\frac{1}{2}\right)\right)\:$

$\frac{3x^2+2x}{x+1}$

$-10+1+2$

$\left(-6\right)^2\:-\:\left(-4\right)^3\:+\:\left(-5\right)^0$