Given that f(x) = x / (x+ (2/x))
The derivative function is given by f'(x) = (Ax^2 + Bx + C) / (x^2+D)^2
From rearranging the original equation, I can get D=2 C=0 and A=0, but I cant seem to find B. Maybe someone could help?
EDIT: I found the answer to be 4, but don't see how this makes sense, since I can only clearly see how -2 would work.