JEE Advanced Mathematics question
Let
f(x) =
and , . Then has
- (A)a local maximum at and a local minimum at Correct
- (B)a local maximum at and a local minimum at
- (C)no local maxima
- (D)no local minima
Answer: (A)
Solution
(wherever is continuous, i.e. on ). Critical points: .
- On : .
- On : .
- On , .
Sign of : positive on , negative
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Question ID VK-110577