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For the function f(x)=x^(2)-6x+8, 2 le x...

For the function `f(x)=x^(2)-6x+8, 2 le x le 4 `, the value of x for which f'(x) vanishes is

A

3

B

`(5)/(2)`

C

`(9)/(4)`

D

`(7)/(2)`

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A
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