If f(x+y)=f(x)-f(y)+2xy-1AAx,yinR. Also ...

If `f(x+y)=f(x)-f(y)+2xy-1AAx,yinR`. Also if f(x) is differentiable and f'(0)=b also `f(x)gt0AAx`, then the set of values of b

`phi`

`{1}`

`{1,2}`

none of these

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