If f(x)=1x−1f(x) = \frac{1}{x-1}f(x)=x−11, what is (f∘f)(x)(f \circ f)(x)(f∘f)(x)?
x−12−x\frac{x-1}{2-x}2−xx−1
xxx
1x2−1\frac{1}{x^2-1}x2−11
x−1x\frac{x-1}{x}xx−1