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If f(x+y)=f(x)f(y) for all x,y in R,f ...

If `f(x+y)=f(x)f(y)` for all `x,y in R,f (1)=2` and `a_r= f (r)` for `r in N`, then the co-ordinates of a point on the parabola `y^2=8x` whose focal distance is 4 may be .

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