if the domain of f(x) is (-1,1) then what is the domain of f((x+1)/(x-1))?
i don't even know how to start this problem. all i know is that x cannot be equal to 1.
The required domain will be the range of the function $\displaystyle y = \frac{x + 1}{x - 1}$ over the interval $\displaystyle -1 < x < 1$. The best way of finding a range is to draw a graph.