Chapter 5 Graphing and Optimization Section 3 L’Hopital’s Rule.

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Presentation transcript:

Chapter 5 Graphing and Optimization Section 3 L’Hopital’s Rule

2 Objectives for Section 5.3 L’Hôpital’s Rule  The student will be able to apply L’Hôpital’s Rule to the Indeterminate Form 0/0.  The student will be able to evaluate one-sided limits and limits at ∞.  The student will be able to apply L’Hôpital’s Rule to the Indeterminate Form ∞/ ∞.

3 Limits involving Powers of x In this section we will develop a powerful technique for evaluating limits of quotients called L’Hôpital’s Rule. To use this rule, it is necessary to be familiar with the limit properties of some basic functions which follow.

4 Limits Involving Powers of x (continued)

5 Limits Involving Exponential and Logarithmic Functions

6 L’Hôpital’s Rule and the Indeterminate Form 0/0

7 L’Hôpital’s Rule and 0/0 (continued) Limits such as the one on the previous slide can be evaluated using L’Hôpital’s Rule :

8 Example

9 Cautionary Example

10 One-Sided Limits and Limits at ∞ Theorem 2. (L’Hôpital’s Rule, Version 2 ) The first version of L’Hôpital’s Rule remains valid if the symbol x → c is replaced everywhere it occurs with one of the following symbols: x → c + x → c – x →∞ x → –∞

11 Example

12 Example

13 L’Hôpital’s Rule and the Indeterminate Form ∞/∞ Theorem 3. (L’Hôpital’s Rule, version 3) Versions 1 and 2 of L’Hôpital’s Rule are also valid if

14 Example