Ejemplo Derivadas Logaritmos
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Transcript of Ejemplo Derivadas Logaritmos
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LOGARITHMIC DIFFERENTIATION
The following problems illustrate the process of logarithmic differentiation. It isa means of differentiating algebraically complicated functions or functions forwhich the ordinary rules of differentiation do not apply. For example, in theproblems that follow, you will be asked to differentiate expressions where avariable is raised to a variable power. An example and two COMMONINCORRECT SOLUTIONS are :
1.)
and
2.) .
BOTH OF THESE SOLUTIONS ARE WRONG because the ordinary rules ofdifferentiation do not apply. Logarithmic differentiation will provide a way todifferentiate a function of this type. It requires deft algebra skills and carefuluse of the following unpopular, but well-known, properties of logarithms.Though the following properties and methods are true for a logarithm of anybase, only the natural logarithm (base e, where e ), , will be usedin this problem set.
PROPERTIES OF THE NATURAL LOGARITHM
1. .
2. .
3. .
4. .
5. .
6. .
AVOID THE FOLLOWING LIST OF COMMON MISTAKES
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1. .
2. .
3. .
4. .
5. .
The following problems range in difficulty from average to challenging.
PROBLEM 1 : Differentiate y = xx .
Click HERE to see a detailed solution to problem 1.
PROBLEM 2 : Differentiate y = x(ex) .
Click HERE to see a detailed solution to problem 2.
PROBLEM 3 : Differentiate y = (3x2+5)1/x
Click HERE to see a detailed solution to problem 3.
PROBLEM 4 : Differentiate .
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Click HERE to see a detailed solution to problem 4.
PROBLEM 5 : Differentiate .
Click HERE to see a detailed solution to problem 5.
PROBLEM 6 : Differentiate .
Click HERE to see a detailed solution to problem 6.
PROBLEM 7 : Differentiate .
Click HERE to see a detailed solution to problem 7.
PROBLEM 8 : Differentiate .
Click HERE to see a detailed solution to problem 8.
PROBLEM 9 : Differentiate .
Click HERE to see a detailed solution to problem 9.
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PROBLEM 10 : Consider the function . Find an
equation of the line tangent to the graph of f at x=1 .
Click HERE to see a detailed solution to problem 10.
PROBLEM 11 : Consider the function .
Determine the slope of the line perpendicular to the graph of f at x=1 .
Click HERE to see a detailed solution to problem 11.
PROBLEM 12 : Differentiate
Click HERE to see a detailed solution to problem 12.
Click HERE to return to the original list of various types ofcalculus problems.
Your comments and suggestions are welcome. Please e-mail any correspondenceto Duane Kouba by clicking on the following address :
About this document ...
Duane Kouba
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1998-06-06