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How many functions f(x)f(x)f(x) from reals to reals are there such that f(0)=0f(0)=0f(0)=0 and for all nonzero reals x,yx,yx,y we have f(xy)=f(x)f(y)−2f(xy)=f(x)f(y)-2f(xy)=f(x)f(y)−2
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