Table of contents
- 0. Functions7h 52m
- Introduction to Functions16m
- Piecewise Functions10m
- Properties of Functions9m
- Common Functions1h 8m
- Transformations5m
- Combining Functions27m
- Exponent rules32m
- Exponential Functions28m
- Logarithmic Functions24m
- Properties of Logarithms34m
- Exponential & Logarithmic Equations35m
- Introduction to Trigonometric Functions38m
- Graphs of Trigonometric Functions44m
- Trigonometric Identities47m
- Inverse Trigonometric Functions48m
- 1. Limits and Continuity2h 2m
- 2. Intro to Derivatives1h 33m
- 3. Techniques of Differentiation3h 18m
- 4. Applications of Derivatives2h 38m
- 5. Graphical Applications of Derivatives6h 2m
- 6. Derivatives of Inverse, Exponential, & Logarithmic Functions2h 37m
- 7. Antiderivatives & Indefinite Integrals1h 26m
- 8. Definite Integrals3h 25m
4. Applications of Derivatives
Differentials
Problem 4.R.77
Textbook Question
60–81. Limits Evaluate the following limits. Use l’Hôpital’s Rule when needed.
lim_ x→0 ⁺ | ln x | ˣ
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1
Recognize that as x approaches 0 from the right, ln(x) approaches negative infinity, making the expression |ln(x)| approach positive infinity.
Rewrite the limit as lim_{x→0⁺} |ln(x)|^x, which can be expressed as lim_{x→0⁺} (ln(x))^x since |ln(x)| is positive for x > 0.
Take the natural logarithm of the limit to simplify the expression: let L = lim_{x→0⁺} (ln(x))^x, then ln(L) = lim_{x→0⁺} x * ln(ln(x)).
Evaluate the limit ln(L) = lim_{x→0⁺} x * ln(ln(x)). As x approaches 0, ln(ln(x)) approaches negative infinity, and x approaches 0, creating an indeterminate form of 0 * (-∞).
Apply l'Hôpital's Rule to resolve the indeterminate form by rewriting it as a fraction: ln(ln(x)) / (1/x) and differentiate the numerator and denominator before re-evaluating the limit.
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