Limits of Functions (including one-sided limits) - AP Calculus AB

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Question

Which of the following is equal to ?

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Answer

The limit of a function as approaches a value exists if and only if the limit from the left is equal to the limit from the right; the actual value of is irrelevant. Since the function is piecewise-defined, we can determine whether these limits are equal by finding the limits of the individual expressions. These are both polynomials, so the limits can be calculated using straightforward substitution:

, so .

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