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If f(x)=x^(3)+3x^(2)+4x+asinx+bcosx, for...

If `f(x)=x^(3)+3x^(2)+4x+asinx+bcosx, forall x in R` is a one-one fuction, then the greatestn value of `(a^(2)+b^(2))` is

A

1

B

2

C

`sqrt2`

D

None

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