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