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let phi(x)=(f(x))^3-3(f(x))^2+4f(x)+5x+3...

let `phi(x)=(f(x))^3-3(f(x))^2+4f(x)+5x+3sinx+4cosx`

A

`phi` is increasing whenever f is increasing

B

`phi` is increasing whenever f is decreasing

C

`phi` is decreasing whenever f is decreasing

D

`phi` is decreasing if `f'(x)=-11`

Text Solution

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The correct Answer is:
A, D
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