Derivative of ln(ln x) Solution | Step-by-Step Guide

  • Thread starter Physicsnut
  • Start date
  • Tags
    Derivative
In summary, the conversation discusses differentiating ln(lnx) by setting f(x)=lnx and using the quotient rule, with the correction that the LaTeX code should be surrounded by ## or $$.
  • #1
Physicsnut
1
0

Homework Statement



Differentiate $$ln(lnx)$$

Homework Equations


The Attempt at a Solution


My solution:
Let $f(x)=lnx$, since${d/dx}ln f(x)={f'(x)/f(x)}$,
${d/dx}ln(lnx)={{1/x}/lnx}/times {1/x}
={1/x^2lnx}$.
 
Physics news on Phys.org
  • #2
Welcome to PF!

Hi Physicsnut! Welcome to PF! :smile:
Physicsnut said:
Let f(x)=lnx, since d/dx ln f(x) = {f'(x)/f(x)},

yes :smile:
{d/dx}ln(lnx) = {{1/x}/lnx}/times {1/x}

nooo :redface:
 
  • #3
Surround your LaTeX code with either ## or $$. A single $ doesn't work. This is deliberate, because it would have confused people who don't use LaTeX but write stuff about money. LaTeX guide for the forum.
 
  • #4
##e^x##
$$x^n$$
[itex]\int f(x)dx[/itex]
[tex]\frac{df}{dx}[/tex]

Wow! All this time I have been using "itex" and "tex"!
 
  • #5
HallsofIvy said:
Wow! All this time I have been using "itex" and "tex"!
The simplified tags have only been available since December 20. :smile:
 

FAQ: Derivative of ln(ln x) Solution | Step-by-Step Guide

What is the derivative of ln(ln x)?

The derivative of ln(ln x) is 1/(x ln x).

How do you find the derivative of ln(ln x)?

To find the derivative of ln(ln x), you can use the chain rule. First, rewrite ln(ln x) as ln(u), where u = ln x. Then, take the derivative of ln(u), which is 1/u. Finally, multiply by the derivative of u, which is 1/x. This gives us 1/(x ln x) as the derivative of ln(ln x).

Can you simplify the derivative of ln(ln x)?

Yes, the derivative of ln(ln x) can be simplified to 1/(x ln x), as this is the most simplified form.

What is the domain of the derivative of ln(ln x)?

The domain of the derivative of ln(ln x) is x > 1, as the natural logarithm function is only defined for positive numbers, and ln x would be undefined for x ≤ 0.

What is the significance of the derivative of ln(ln x)?

The derivative of ln(ln x) is useful in many real-life applications, such as in economics and finance, where it can be used to calculate marginal revenue and marginal cost. It is also commonly used in physics and engineering to calculate rates of change and growth. Additionally, the derivative of ln(ln x) is an important step in finding the derivatives of other logarithmic functions.

Back
Top