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Find the value of a for which the functi...

Find the value of `a` for which the function `(a+2)x^3-3a x^2+9a x-1` decreases montonically for all real `xdot`

A

`(-oo,-3)`

B

`(-oo,-2) uu (-2,3)`

C

`(-3,oo)`

D

None of these

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The correct Answer is:
A
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