1. If $\displaystyle{\lim_{x\to 1^-} f(x) = 5}$, then $\displaystyle{\lim_{x\to 1} f(x) = 5}$.
2. If $\displaystyle{\lim_{x\to 1^-} f(x) = 5}$, then $\displaystyle{\lim_{x\to 1^+} f(x) = 5}$.
3. If $\displaystyle{\lim_{x\to 1} f(x) = 5}$, then $\displaystyle{\lim_{x\to 1^-} f(x) = 5}$.
4. If $\displaystyle{\lim_{x\to 1} f(x) = 5}$, then $\displaystyle{\lim_{x\to 1^+} f(x) = 5}$.
5. Select all true statements. Assume that all the limits are all taken at the same point.

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