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For which interval the given function f(...

For which interval the given function `f(x)=2x^3-9x^2+12x+1` is decreasing?

A

`(-2, oo)`

B

`(-2, -1)`

C

`(-oo, -1)`

D

`(-oo, -2) or (-1, oo)`

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The correct Answer is:
D
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