Step 1 :First, we need to find f(g(x)) and g(f(x)).
Step 2 :For f(g(x)), we substitute g(x) into f(x), so we get: \(f(g(x)) = f(\frac{1}{3x}) = \frac{1}{3*(\frac{1}{3x})} = x\)
Step 3 :For g(f(x)), we substitute f(x) into g(x), so we get: \(g(f(x)) = g(\frac{1}{3x}) = \frac{1}{3*(\frac{1}{3x})} = x\)
Step 4 :Since \(f(g(x)) = g(f(x)) = x\), f and g are inverses of each other. \(\boxed{f \text{ and } g \text{ are inverses of each other}}\)
Step 5 :For f(g(x)), we substitute g(x) into f(x), so we get: \(f(g(x)) = f(x+4) = (x+4) + 4 = x + 8\)
Step 6 :For g(f(x)), we substitute f(x) into g(x), so we get: \(g(f(x)) = g(x+4) = (x+4) + 4 = x + 8\)
Step 7 :Since \(f(g(x)) = g(f(x)) = x + 8\), which is not equal to x, f and g are not inverses of each other. \(\boxed{f \text{ and } g \text{ are not inverses of each other}}\)