3.4 Exercise 48

Use each set of functions to find $f \left(g \left(h \left(x\right)\right)\right) .$ Simplify your answers.

For $f \left(x\right) = \frac{1}{x}$ and $g \left(x\right) = \sqrt{x - 1} ,$ write the domain of $\left(f \circ g\right) \left(x\right)$ in interval notation.