What is the value of $\frac{1+x}{1-x^2}÷\frac{1+x}{1-x^4}-\frac{1-x^4}{1-x}×\frac{(1+x)}{1-x^2}$?

$\frac{2x(1+x^2)}{(1-x)}$ $\frac{2x(1+x^2)}{(x-1)}$ $(1-x)^2$ $(1+x^2)$

$\frac{2x(1+x^2)}{(x-1)}$