5.1 the natural logarithmic function: differentiation ab and bc 2015
TRANSCRIPT
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5.1 The Natural Logarithmic Function: Differentiation
AB and BC2015
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Calculus Warm-Up 5.1
3 2 25 4y y y x
Find the derivative with respect to x:
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Calculus Warm-Up 5.1
1dxx
Find the indefinite integral:
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Expanding Logarithmic Expressions
22
3 2
10ln
9
ln 3x 2
6xln
5
x 3ln
x x 1
ln10 ln 9
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The Number e
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Derivative of ln x: 0x
lny xThe natural log function as follows:
ye x
Now differentiate implicitlywith respect to x: 1ye y
Rewrite in exponential form:
1ln
dx
dx x
1 1y
ye x
Derivative of ln x
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Example 1 – Differentiation of Logarithmic Functions
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Example 1 – Differentiation of Logarithmic Functions
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You Try:
e. ln 1d
xdx
1
2 2x
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Example 2 – Differentiation of Logarithmic Functions
2 2
3
( 1)Differentiate ( ) ln
2 1
x xf x
x
1/ 22 2 3ln ( 1) ln 2 1x x x
2 31ln 2ln( 1) ln 2 1
2x x x
2
2 3
1 2 1 6'( ) 2
1 2 2 1
x xf x
x x x
2
2 3
1 4 3
1 2 1
x x
x x x
Be sure you see the benefit of applying logarithmic properties
before you differentiate.
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Example 3 – You Try
31
ln1
xf x
x
Find the derivative of the function:
2
2
3 1f x
x
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If u > 0,
, ln ln .d d u u
u u and u udx dx u u
If u < 0,
, ln .d u
u u and udx u
The natural log function is undefined for negative numbers
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Example 4 – Derivative Involving Absolute Value
You Try: Find the derivative of
f(x) = ln | cosx |.
Solution:
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Example 5 – Derivative Involving Absolute Value
You Try: Find the derivative of
f(x) = ln | secx+tanx |.
secy x
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Finding Relative Extrema
• Locate the Relative Extrema of:
2y ln x 2x 3
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Sometimes, it is convenient to use logarithms as aids in differentiating nonlogarithmic functions.
This procedure is called logarithmic differentiation.
Logarithmic Differentiation (Optional)
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Example 6 – Logarithmic Differentiation
Find the derivative of
Solution:Note that y > 0 for all x ≠ 2. So, ln y is defined. Begin by taking the natural logarithm of each side of the equation.
Then apply logarithmic properties and differentiate implicitly.
Finally, solve for y'.
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Example 6 – Solutioncont’d
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5.1 AB Homework
• Page 330 45-59 odd, 63, 71, 77, 79, 83, 85
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5.1 BC Homework
• Day 1: Pg. 330 45-59 odd, 63, 71, 77, 79, 83, 85, 93-97 odd
• Day 2: MMM pgs.191-192