Math Problem Statement

Find dy/dx if y = ln_e(ln_e(x)).

Solution

The problem asks to find the derivative dydx\frac{dy}{dx}, where y=lne(lnex)y = \ln_e(\ln_e x), which can be written as y=ln(lnx)y = \ln(\ln x).

To differentiate y=ln(lnx)y = \ln(\ln x) with respect to xx, we apply the chain rule. Here's how to proceed:

  1. First, differentiate the outer function lnu\ln u with respect to its argument u=lnxu = \ln x: dduln(u)=1u\frac{d}{du} \ln(u) = \frac{1}{u} So, dydu=1lnx\frac{dy}{du} = \frac{1}{\ln x}.

  2. Then, differentiate the inner function lnx\ln x with respect to xx: ddxlnx=1x\frac{d}{dx} \ln x = \frac{1}{x}

  3. Now, applying the chain rule: dydx=1lnx1x=1xlnx\frac{dy}{dx} = \frac{1}{\ln x} \cdot \frac{1}{x} = \frac{1}{x \ln x}

Thus, the derivative is: dydx=1xlnx\frac{dy}{dx} = \frac{1}{x \ln x}

Would you like more details or have any further questions?

Here are some related questions:

  1. What is the derivative of ln(ln(lnx))\ln(\ln(\ln x))?
  2. How does the chain rule work for composite functions?
  3. What is the derivative of lnx\ln x alone?
  4. How would you differentiate y=ln(x2)y = \ln(x^2)?
  5. What are some common applications of the natural logarithm function in calculus?

Tip: Remember to apply the chain rule when differentiating nested functions!

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Math Problem Analysis

Mathematical Concepts

Calculus
Derivatives
Logarithmic Functions
Chain Rule

Formulas

d/dx(ln(x)) = 1/x
Chain Rule: dy/dx = (dy/du) * (du/dx)

Theorems

Chain Rule
Logarithmic Differentiation

Suitable Grade Level

College level (Calculus 1)