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CUET · MATHS · PYQ PAPER 2023

A function \(f:[0,2] \rightarrow R\) is strictly increasing in \([0,1]\) and strictly decreasing in \([1,2]\). Then which statement is TRUE?

  1. A \(f^{\prime}(1)\) exists and is not equal to 0
  2. B \(f^{\prime}(x)=0\) for all \(x \in[0,2]\)
  3. C \(f^{\prime}(1)\) may not exist
  4. D \(f^{\prime}(1)\) does not exist
Verified Solution

Answer & Solution

Correct Answer

(C) \(f^{\prime}(1)\) may not exist

Step-by-step Solution

Detailed explanation

The function \(f(x)\) reaches a local maximum at \(x=1\) because it changes from strictly increasing to strictly decreasing. While \(f'(1) = 0\) if the function is smooth, it could also have a "sharp" peak (like \(f(x) = -|x-1|\)) where the derivative is undefined. Therefore,…