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Identify the inside function, $u=g(x)$, and the outside function, $y=f(u)$. \[ \begin{aligned} y & =\left(x^{2}-7 x+9\right)^{4} \\ u=g(x) & =2 x-7 \\ y & =f(u)= \end{aligned} \]Identify the inside function, u = g(x), and the outside function, y = f(u). y = (x^2 − 7x + 9)^4

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