Find the derivative of y with respect to x, where y = ln(1 / (sqrt(x) / (x + 1))).

Question image

Understand the Problem

The question is asking to find the derivative of a given function with respect to x. This involves applying differentiation rules to the logarithmic function and the expression inside it.

Answer

The derivative is: $$ \frac{dy}{dx} = \frac{-\frac{x + 1}{2x} + \frac{2x}{x + 1}}{(x + 1)} $$
Answer for screen readers

The derivative of ( y ) with respect to ( x ) is:
$$ \frac{dy}{dx} = \frac{-\frac{x + 1}{2x} + \frac{2x}{x + 1}}{(x + 1)} $$

Steps to Solve

  1. Rewrite the function
    Start with the function for clarification:
    $$ y = \ln \left(\frac{1}{\frac{\sqrt{x}}{x + 1}}\right) $$
    This can be rewritten using properties of logarithms:
    $$ y = \ln(1) - \ln\left(\frac{\sqrt{x}}{x + 1}\right) $$
    Since $ \ln(1) = 0$:
    $$ y = -\ln\left(\frac{\sqrt{x}}{x + 1}\right) $$

  2. Apply the logarithm rule
    Use the quotient rule of logarithms:
    $$ y = - \left(\ln(\sqrt{x}) - \ln(x + 1)\right) $$
    This can be further simplified:
    $$ y = - \left(\frac{1}{2} \ln(x) - \ln(x + 1)\right) $$
    Thus,
    $$ y = -\frac{1}{2} \ln(x) + \ln(x + 1) $$

  3. Differentiate the function
    Now, differentiate $y$ with respect to $x$:
    Using the derivative rules:
    $$ \frac{dy}{dx} = -\frac{1}{2} \cdot \frac{1}{x} + \frac{1}{x + 1} $$

  4. Combine the fractions
    To combine the two terms, find a common denominator:
    $$ \frac{dy}{dx} = -\frac{1}{2x} + \frac{1}{x + 1} = \frac{-\frac{1}{2x}(x + 1) + \frac{1}{x + 1}(2x)}{(x + 1)} $$
    Simplify:
    $$ \frac{dy}{dx} = \frac{-\frac{x + 1}{2x} + \frac{2x}{x + 1}}{(x + 1)} $$
    Which can be further simplified for the final expression.

The derivative of ( y ) with respect to ( x ) is:
$$ \frac{dy}{dx} = \frac{-\frac{x + 1}{2x} + \frac{2x}{x + 1}}{(x + 1)} $$

More Information

This derivative showcases the rules of logarithmic differentiation and how to manipulate logarithmic expressions effectively.

Tips

  • Forgetting to apply the logarithmic identities correctly.
  • Misapplying the quotient rule or chain rule during differentiation.
  • Neglecting to simplify the final expression.

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