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Find (fog)(4).
f(x) = x + 1
g(x) = x²

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(f\circ g)(x)=f(g(x))\\\\f(x)=x+1\\g(x)=x^2\\\\(f\circ g)(x)=x^2+1\\\\(f\circ g)(4)=4^2+1=17

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