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December 20, 2014

December 20, 2014

Posted by **iris** on Tuesday, November 29, 2011 at 1:49pm.

x-1 x+1

- math -
**Steve**, Tuesday, November 29, 2011 at 2:26pmIf that means

(x+1)/(x-1) - (x-1)/(x+1) then we have

[(x+1)^2 - (x-1)^2]/(x^2-1)

= [(x^2 + 2x + 1 - (x^2 - 2x + 1)]/(x^2-1)

= 4x/(x^2-1)

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