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CUET · MATHS · PYQ PAPER 2023

The differentiation of \(\frac{x^3}{1-x^3}\) w.r.t. \(x^3\) is:

  1. A \(\frac{2}{\left(1-x^3\right)^2}\)
  2. B \(\frac{1}{\left(1-x^3\right)^2}\)
  3. C \(-\frac{1}{\left(1-x^3\right)^2}\)
  4. D \(\frac{1}{1-x^3}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{1}{\left(1-x^3\right)^2}\)

Step-by-step Solution

Detailed explanation

Let \( u = x^3 \). The expression becomes \( \frac{u}{1-u} \). \( \frac{d}{du}\left(\frac{u}{1-u}\right) = \frac{(1)(1-u) - u(-1)}{(1-u)^2} \) \( = \frac{1-u+u}{(1-u)^2} \) \( = \frac{1}{(1-u)^2} \) Substitute \( u = x^3 \): \( \frac{1}{(1-x^3)^2} \).
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