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The limit is
.
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To evaluate the limit
we start by recognizing that directly substituting
leads to the indeterminate form
. Therefore, we can use the technique of rationalizing the numerator.
We multiply the numerator and the denominator by the conjugate of the numerator:
The numerator simplifies as follows:
Thus, we can simplify the expression:
Now we substitute
back to 0:
Thus, the limit is