Define the function formula for each of the following given the function definitions for $f$ and $g$. Simplify your answer
as much as possible. If you do not simplify your answer, it will be marked wrong.
$f(x) = \frac{1}{x - 3}$
$g(x) = \frac{x + 3}{x}$
a. $(f \circ g)(x) = $
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b. $(g \circ f)(x) = $
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