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f:R^+ ->R is a continuous function satis...

`f:R^+ ->R` is a continuous function satisfying `f(x/y)=f(x)-f(y) AAx,y in R^+`.If f'(1)=1,then (a)f is unbounded (b)`lim_(x->0)f(1/x)=0` (c)`lim_(x->0)f(1+x)/x=1` (d)`lim_(x->0)x.f(x)=0`

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