GATE DA 2024 Set 1 — Question 15
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Question
For any twice differentiable function , if at some , and , then the function necessarily has a ______ at .Note: denotes the set of real numbers.
Correct answer
(A) local minimum
Solution
This is the standard Second Derivative Test for local extrema:
1. indicates that is a critical point (stationary point).
2. indicates that the function is concave up (convex) at .
Therefore, has a local minimum at . It is not necessarily a global minimum without further information about the function over the entire domain.Continue learning with Success Tracker
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