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The function f defined by f(x) = x^(...

The function f defined by
`f(x) = x^(3) - 6x^(2) - 36 x + 7` is increasing , if

A

increasing on R

B

decreasing on R

C

decreasing on `(0, oo)` and increasing on `(-oo,0)`

D

increasing on `(0, oo)` and decreasing on `(-oo, 0)`

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The correct Answer is:
A
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