Maxima and MinimaHard
Question
If f′(c) changes sign from positive to negative as x passes through c, then,
Options
A.f(c) is neither a maximum nor a minimum value of f(x)
B.f(c) is a maximum value of f(x)
C.f(c) is a minimum value of f(x)
D.f(c) is either a maximum or minimum value of f(x)
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