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If for a function f(x),f^'(a)=0,f^(' ')(...

If for a function `f(x),f^'(a)=0,f^(' ')(a)=0,f^(''')(a)>0,` then at `x=a ,f(x)` has a (a) minimum value (b) maximum value (c)not an extreme point (d) extreme point

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