1.

Let f(x)+f(y)=f (x sqrt(1-y^(2))+ y sqrt(1-x^(2))) [f(x) is not identically zero]. Then

Answer»

`f(4x^(3)-3x) + 3F(x)=0`
`f(4x^(3)-3x)=3f(x)`
`f(2X sqrt(1-x^(2)))+2F(x)=0`
`f(2x sqrt(1-x^(2)))=2f(x)`

ANSWER :A::D


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