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The values of a for which the function (...

The values of a for which the function `(a+2)x^3 - 3x^2 + 9ax-1` decreases monotonically throughout for all real x are :-

A

`alt-2`

B

`agt-2`

C

`-3ltalt0`

D

`-inftyltale-3`

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The correct Answer is:
D
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