[" Let "phi(x)={{(x)}^(3)-3(f(x))^(2)+4f...

[" Let "phi(x)={{(x)}^(3)-3(f(x))^(2)+4f(x)+5x+3sin x+4cos x AA x in R," then "-],[[" (A) "phi" is increasing whenever "f" is increasing "," (B) "phi" is increasing whenever "f" is decreasing "],[" (C) is decreasing whenever "f" is decreasing "," (D) "phi" is decreasing if "f(x)=-11]]

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phi(x)=(f(x))^(3)-3(f(x))^(2)+4f(x)+5x+3sin x+4cos x

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