\(lim_{π₯ββ} \ \ π₯^{1/π₯} \)
2015
\(lim_{π₯ββ} \ \ π₯^{1/π₯} \)
- A.
β
- B.
0
- C.
1
- D.
Not defined
Attempted by 73 students.
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Correct answer: C
Key idea: rewrite the power using the exponential and natural logarithm to evaluate the limit of the exponent.
Rewrite the expression: x^{1/x} = exp((1/x) \u200bln x).
Evaluate the exponent: consider (ln x)/x as x β β. This ratio tends to 0 (for example, apply l'HΓ΄pital's rule: derivative of ln x is 1/x and derivative of x is 1, so the limit is 0).
Conclude the limit: exp((ln x)/x) β exp(0) = 1, so the limit of x^{1/x} as x β β is 1.
Therefore the limit equals 1.