Question 207340
{{{(x-1)/(x^2+1)}}} * {{{(x^4-1)/(x-1)^2}}} * {{{(x^2-1)/(x^4-2x^2+1)}}}
Factor
{{{(x-1)/(x^2+1)}}} * {{{((x^2-1)(x^2+1))/((x-1)(x-1))}}} * {{{((x+1)(x-1))/((x^2-1)(x^2-1))}}}
:
Cancel the (x-1)'s, leaving:
{{{1/(x^2+1)}}} * {{{(x^2-1)(x^2+1))}}} * {{{((x+1))/((x^2-1)(x^2-1))}}}
:
Cancel the (x^2 + 1)
1 * {{{(x^2-1)}}} * {{{((x+1))/((x^2-1)(x^2-1))}}}
:
Cancel (x^2-1) 
1 * {{{((x+1))/((x^2-1))}}}
:
x^2 - 1 can be factored
{{{((x+1))/((x+1)(x-1))}}}
:
Cancel (x+1)
{{{1/(x-1)}}}