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12. Which of the following statements is true?
(A) If limx→c f(x) = L, then f(c) = L
(B) limx→π sin x/x = 1
(C) If f and g are functions, then (f(g(x)) = g(f(x)) for all values of x.
(D) For polynomial functions, the limits at all x-values from the right and the left must exist and must be equal.

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