1.

If f : R to R such thatf(x- f(y))= f( f(y) ) +x f (y)+f(x)- 1 AA , y in Rthen f(x) is

Answer»

`1+ (x^(2))/(4)`
`1- (x^(2))/(2)`
`1+ (x^(2))/(2)`
`1-(x^(2))/(4)`

Answer :B


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