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Find the values ' a ' for which the func...

Find the values `' a '` for which the function `f(x)=(a+2)x^3-3a x^2+9a x-1` decreases for all real values of `x` .

A

`(-oo, -3)`

B

`(-oo ,0)`

C

`(-3,0)`

D

`(-3,oo)`

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The correct Answer is:
A
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