$\left(\frac{1}{64}m^9\right)+3\left(\frac{1}{16}m^6\right)\left(\frac{1}{3}n\right)+3\left(\frac{1}{4}m^3\right)\left(\frac{1}{9}n^2\right)+\left(\frac{1}{27}n^3\right)$

$\frac{125}{729}d^{18}+\frac{1000}{343}e^6$

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

$h^2-27h-50$

$\int\frac{x+1}{\sqrt[2]{6\cdot x+x^2-8}}dx$

$\left(x^2+5\right)\cdot\left(x^2-5\right)$

$\cos\left(4x\right)-cos2x$