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For f:R rarr R, f(x)=x^(4)-8x^(3)+22x^(2...

For `f:R rarr R, f(x)=x^(4)-8x^(3)+22x^(2)-24x`, the sum of all local extreme value of f(x) is equal to

A

`-9`

B

`-8`

C

`-17`

D

`6`

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The correct Answer is:
D
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