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Let F(x)=1+f(x)+(f(x))^2+(f(x))^3 where ...

Let `F(x)=1+f(x)+(f(x))^2+(f(x))^3` where `f(x)` is an increasing differentiable function and `F(x)=0` has a positive root, then

A

F(x) is an increasing function

B

`F(0)le0`

C

`f(0)le-1`

D

`F(0)gt0`

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