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The Natural Logarithmic Functions:  Differentiation Differentiation, implicit differentiation, tangent lines.
So from the definition of the ln function, we should be able to figure out the derivative of the ln function.  Part 2 just follows from the chain rule.
Ex. 3 p. 326  Differentiation of Logarithmic Functions Product rule! Chain Rule!
Ex 4 p. 236  Logarithmic Properties as an aid to differentiation. Differentiate  Rewrite before differentiating:
Ex 5. p327  Logarithmic Properties as aids to differentiating Differentiate  Rewrite! This would have been very difficult without the rewrite!
Sometimes it is useful or even necessary to use logarithmic aids in  non-logarithmic  problems. Ex 6 p. 327  Logarithmic Differentiation  Differentiate Take natural log of BOTH sides Expand right side Differentiate implicitly Simplify and solve for y’ Simplify
Example where it is  necessary  to use logarithmic differentiation! Differentiate  Take ln of both sides Product rule, differentiate implicitly Simplify, solve for y’ Substitute in y Whew!
In more abstract form, d/dx (u^v) = (u^v)(d/dx (v ln u)) = u^v(vu'/u + v'ln u))  as discovered by one of our students! I think he should submit for publication and get his name on a theorem.
Because the natural log is undefined for negative numbers, we often encounter functions defined as y = ln |u|.  You can disregard the absolute value symbols and differentiate as usual! See proof on p. 328 if interested.
Ex 7 p. 328  Derivative involving absolute value
Ex. 8 p. 328  Finding relative extrema Locate relative extrema of  First, differentiate y,  then find critical numbers. Critical numbers of numerator are x = 1, -1. From the denominator, x ≈ -2.2790188, which is not in domain. Applying first derivative test, in the interval [-2, -1),  y’ > 0 so increasing on that interval.  In the interval (-1, 1), y’ < 0 so decreasing on that interval and  point  (-1, ln 7)  is Rel. Max.  In interval (1,  ∞), y’ > 0 so point  (1, ln 3)  is  a Rel. Min.
You can do anything with natural log functions that you can do with other kinds of functions, so you can find equations of tangent lines at some point, equations of normal lines at some point, relative extrema, inflection points, etc.
5.1b p. 329/ 43-87 EOO, do 77,81,93,95,104-105

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Calc 5.1b

  • 1. The Natural Logarithmic Functions: Differentiation Differentiation, implicit differentiation, tangent lines.
  • 2. So from the definition of the ln function, we should be able to figure out the derivative of the ln function. Part 2 just follows from the chain rule.
  • 3. Ex. 3 p. 326 Differentiation of Logarithmic Functions Product rule! Chain Rule!
  • 4. Ex 4 p. 236 Logarithmic Properties as an aid to differentiation. Differentiate Rewrite before differentiating:
  • 5. Ex 5. p327 Logarithmic Properties as aids to differentiating Differentiate Rewrite! This would have been very difficult without the rewrite!
  • 6. Sometimes it is useful or even necessary to use logarithmic aids in non-logarithmic problems. Ex 6 p. 327 Logarithmic Differentiation Differentiate Take natural log of BOTH sides Expand right side Differentiate implicitly Simplify and solve for y’ Simplify
  • 7. Example where it is necessary to use logarithmic differentiation! Differentiate Take ln of both sides Product rule, differentiate implicitly Simplify, solve for y’ Substitute in y Whew!
  • 8. In more abstract form, d/dx (u^v) = (u^v)(d/dx (v ln u)) = u^v(vu'/u + v'ln u)) as discovered by one of our students! I think he should submit for publication and get his name on a theorem.
  • 9. Because the natural log is undefined for negative numbers, we often encounter functions defined as y = ln |u|. You can disregard the absolute value symbols and differentiate as usual! See proof on p. 328 if interested.
  • 10. Ex 7 p. 328 Derivative involving absolute value
  • 11. Ex. 8 p. 328 Finding relative extrema Locate relative extrema of First, differentiate y, then find critical numbers. Critical numbers of numerator are x = 1, -1. From the denominator, x ≈ -2.2790188, which is not in domain. Applying first derivative test, in the interval [-2, -1), y’ > 0 so increasing on that interval. In the interval (-1, 1), y’ < 0 so decreasing on that interval and point (-1, ln 7) is Rel. Max. In interval (1, ∞), y’ > 0 so point (1, ln 3) is a Rel. Min.
  • 12. You can do anything with natural log functions that you can do with other kinds of functions, so you can find equations of tangent lines at some point, equations of normal lines at some point, relative extrema, inflection points, etc.
  • 13. 5.1b p. 329/ 43-87 EOO, do 77,81,93,95,104-105