\displaystyle \lim_{x \to 1^-} f(x) =\displaystyle \lim_{x \to 1^+} f(x) =\displaystyle \lim_{x \to 1} f(x) =\displaystyle \lim_{x \to 4^-} f(x) =\displaystyle \lim_{x \to 4^+} f(x) =\displaystyle \lim_{x \to 4} f(x) =

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