$\left(w-x\right)\left(x^2+xw+w^2\right)$

$\lim_{x\to1}\left(\frac{\left(x+3\right)\left(x-1\right)}{x^2-1}\right)$

$\left(3x^4+3x^2-2x\right)\cdot\left(2x\right)$

$\cot x\sin x-\cos x$

$\int arc\cdot cot\left(x\right)dx$

$\left(\frac{5a}{b^4}\right)^3$

$\int\frac{xlnx}{\left(x^2-1\right)^{\frac{3}{2}}}dx$