$\lim_{x\to4}\left(\frac{x^3-6x^2+9x}{\left(x-3\right)^2}\right)$

$3\left(-2\right)^{2-1}$

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

$\frac{3}{4}x^{2}y-\frac{8}{9}xy^{1}$

$\left(\frac{3y^2}{y^{-3}}\right)^{-2}$

$\left(x^2-9\right)\left(x^2+9\right)$

$log9q=log\left(4q-6\right)$