Question

[tex] \frac{x-1}{x+1} - \frac{x+1}{x-1} + \frac{2( x^{2}+1)}{ x^{2} -1}

[/tex]

Answer 1

x-1/x+1-x+1/x-1+2(x^2+1)/x^2-1=2x2−4x+2/x2−1=2(x−1)/(x−1)(x+1)(x−1)=2x−2/x+1