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The set of values of a for which f(x)=x^...

The set of values of a for which `f(x)=x^(3)-ax^(2)+48x+1` is increasing for all real values of x is

A

`(-12,12)`

B

`(-oo,-12)`

C

`(12,oo)`

D

`(-oo,oo)`

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The correct Answer is:
A
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