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Which of the following statements are always true? Select all that apply.
(f ∘ g) ∘ h = f ∘ (g ∘ h)
(f ∘ g)(x) = f(g(x))
(f ∘ g)(x) = (g ∘ f)(x)
A function that always returns its argument is called an identity function.
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