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AP Calculus AB Chapter 5, Section 1. Natural Logarithmic Functions: Differentiation 2013 - 2014. The Natural Logarithmic Function. This about what you know about the integral power rule. One important disclaimer: it doesn’t apply when n = -1. What would happen if n = -1??.
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AP Calculus ABChapter 5, Section 1 Natural Logarithmic Functions: Differentiation 2013 - 2014
The Natural Logarithmic Function • This about what you know about the integral power rule. • One important disclaimer: it doesn’t apply when n = -1. • What would happen if n = -1??
The Natural Logarithmic Function • Definition of the Natural Logarithmic Function: • The domain of the natural logarithmic function is the set of all positive real numbers.
Let’s look at the graph • Set your window to [-1, 10] by [-5, 5] • Graph in and sketch below. • Graph in and sketch below.
Theorem: Properties of the Natural Logarithmic Function • The natural logarithmic function has the following properties: • The domain is (0, ∞) and the range is (-∞, ∞). • The function is continuous, increasing, and one-to-one. • The graph is concave downward. • Do you remember how we check for concavity?????
Theorem: Logarithmic Properties • If a and b are positive numbers and n is rational, then the following properties are true:
The Number e • The number e is the base of ln. • e and ln are inverses of each other. • In the equation , the value of x to make this statement true is e. • e is irrational and has the decimal approximation
Definition of e • The letter e denotes the positive real number such that
The Derivative of the Natural Logarithmic Function • Let u be a differential function of x
Logarithmic Properties as Aids to Differentiation • Differentiate:
Logarithmic Properties as Aids to Differentiation • Differentiate:
Logarithmic Differentiation • Find the derivative of
Derivative Involving Absolute Value • If u is a differentiable function of x such that , then
Derivative Involving Absolute Value • Find the derivative of
Finding Relative Extrema • Locate the relative extrema of
Ch 5.1 Homework • Pg 329 – 330, #’s: 7 – 10, 15, 21, 27, 29, 33, 41, 49, 55, 61, 71, 75, 79