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The function f(x) =x^3-9x^2+15x+25 is de...

The function `f(x) =x^3-9x^2+15x+25` is decreasing in

A

`phi`

B

R

C

(1,5)

D

`(-oo,1)cup(5,oo)`

Text Solution

Verified by Experts

The correct Answer is:
C
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