Find f(x)-1/f(x), when f(x) = (x+1)/(x-1)? Indicate all correct options. [n^2 = n*n]
A. 2
B. 2/(x^2-1)
C. 4x/(x^2-1)
D. 4x/[(x+1)(x-1)]
E. 2(x^2+2x-1)/(x^2-1)

• option B.
  f(x)-1/f(x)=[(x+1)/(x-1)]-[(x-1)/(x+1)]
  =(x+1-x+1)/(x^2-1)
  =2/(x^2-1)
• 4 years agoHelpfull: Yes(0) No(0)