$\frac{2}{-x-1}$

$( a - b x ) ( a + b x )$

$\left(\frac{2r^3t^6}{5u^9}\right)^4$

$\frac{d}{dx}\left(\frac{\left(x+1\right)}{x^2\left(3x-4\right)}\right)$

$a+b+a^2+b+a^3+b$

$8-3-\left(-3\right)\left(5-7\right)$

$\lim_{x\to0}\left(\frac{x+\ln\left(6\right)}{x-\ln\left(6\right)}\right)^x$