$\left(2^3.9\right)\frac{4}{5}$

$\lim_{x\to0}\left(\frac{5\sin\left(x\right)-5x}{4x-2e^x+2e^{-x}}\right)$

$\frac{9x^2y^3}{24a^2x^3y^4}$

$\left(2\right)\:\log_e\left(3\right)=\log_e\left(x-4\right)$

$8xy^2-7x^2y+13-13xy^2+7x^2y-5$

$\:\left(\frac{4}{3}x^2y^3\right)^3$

$\frac{-16^2}{n}$