$\left(7ax\right)^2$

$\sqrt{8a}.\:\sqrt{3a^3}$

$1600y^2-900z^2$

$5v^3y\left(-2v^{-2}y+3v^2-1\right)$

$2\log\left(g\right)-3\log\left(y\right)+\log\left(n\right)$

$\lim_{x\to0}\left(\frac{\ln\left(\sin\left(6x\right)\right)}{\ln\left(\sin\left(x\right)\right)}\right)$

$\frac{-2x^3-4x^2-4x+7}{x+1}$