Let \(f(x)=\frac{x-1}{x+1}\), then f(f(x)) is
A. \(\frac{1}{x}\)
B. \(-\frac{1}{x}\)
C. \(\frac{1}{x+1}\)
D. \(\frac{1}{x-1}\)
Answer:B
Let \(f(x)=\frac{x-1}{x+1}\), then f(f(x)) is
A. \(\frac{1}{x}\) B. \(-\frac{1}{x}\) C. \(\frac{1}{x+1}\) D. \(\frac{1}{x-1}\)