Find $f \circ g$ and $g \circ f$. $f(x) = \frac{2}{x^2 - 1}$, $g(x) = x + 1$ (a) $f \circ g$ (b) $g \circ f$ Find the domain of each function and each composite function. (Enter your answers using interval notation.) domain of $f$ domain of $g$ domain of $f \circ g$ domain of $g \circ f$
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