$\left(x-\frac{3}{5}\right)^3\left(\frac{4}{5}-x\right)$

$\left(3a^3-b^2\right)\:\left(a^3+b^2\right)$

$\log\left(x+1\right)+\log\left(5x\right)$

$\lim_{x\to0}\left(\frac{x^3+6x^2+12x}{x}\right)$

$2xy^3+ycosx$

$16-11+8x-4$

$\lim_{x\to0}\left(\frac{ln\left(cos\:x\right)}{x^{-1}}\right)$