$-2x-72x^{2}+30x-20$

$4=x-5$

$\lim_{x\to0}\:\left(x^2+x\right)^{\frac{1}{\ln\left(x\right)}}$

$\lim_{x\to-1}\left(\frac{2x^4+6x^3+x+5}{x+1}\right)$

$\int_0^1\left(\frac{4x-12}{\sqrt{x^2-6x+9}}\right)dx$

$\left(x^3+w\right)\left(x^3-w\right)$

$x+3\left(x^3+5x^2+13x+27\:\right)$