If f(x)=x−1f(x) = \sqrt{x-1}f(x)=x−1 and g(x)=x2+1g(x) = x^2+1g(x)=x2+1, what is (f∘g)(x)(f \circ g)(x)(f∘g)(x)?
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x2\sqrt{x^2}x2
∣x∣|x|∣x∣
x2x^2x2