$2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2$

$\left(-9z^3bcd^0\right)^5$

$\frac{-9x-3}{-3}$

$7x^2+10x-8$

$\lim_{x\to1}\left[\sqrt{\left(x+8\right)}\:-3\right]$

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

$\:\frac{\left(1-sin\left(t\right)\right)^2}{cos^2\left(t\right)}=\frac{1-sin\left(t\right)}{1+sin\left(t\right)}$