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If f'(c) = 0 and f''(c) < 0 at an interior point c, the second derivative test says f has
Aa local minimum at c
Ban inflection point only
Cno definite conclusion
Da local maximum at c
Answer & Solution
Correct answer: D. a local maximum at c
A negative second derivative means the graph is concave down at the stationary point, which is a peak.
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