1.
Let f:RRf: \mathbb{R} \to \mathbb{R} be defined as f(x)=x1f(x) = x-1 and g:R{1,1}Rg: \mathbb{R} - \{1, -1\} \to \mathbb{R} be defined as g(x)=x2x21g(x) = \frac{x^2}{x^2-1}. Then the function fgf \circ g is: