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Let f(x) be a function such that f'(a) n...

Let f(x) be a function such that `f'(a) ne 0` . Then , at x=a, f(x)

A

f(x) cannot have maximum at ` x = a`

B

f(x) cannot be minimum at `x = a`

C

f(x) must have neither a maximum nor a minimum at `x = a`.

D

none of these

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