**Composite Functions and Domain Analysis** For the functions \( f(x) = \frac{2}{x-9} \) and \( g(x) = \frac{1}{x} \), evaluate the following composite functions and determine the domain of each: 1. (a) \( f \circ g \) 2. (b) \( g \circ f \) 3. (c) \( f \circ f \) 4. (d) \( g \circ g \) **Task:** (a) Calculate \( (f \circ g)(x) = \) ________ (Simplify your answer.)