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1
Choose several input values that approach a a from both the left and right. ...
2
Evaluate the function at each input value. ...
3
Determine if the table values indicate a left-hand limit and a right-hand limit.
4
If the left-hand and right-hand limits exist and are equal, there is a two-sided limit.
Remember, for the limit to exist, the left- and right-hand limits must be equal. Avoid jumping to conclusions about the limit value after only approaching your desired
-value from one side.