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Let f(x+y)=f(x)+f(y)+2xy-1AAx,yinRR, I...

Let `f(x+y)=f(x)+f(y)+2xy-1``AAx,yinRR,` If f(x) is differentiable and f'(0) = sin `phi` then -

A

`f(x)lt0AAx inRR`

B

`f(x)gt0AAx inRR`

C

`f(x)ge(3)/(4),AAx inRR`

D

`-1lef(x)le1,AAx inRR`

Text Solution

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The correct Answer is:
B, C
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