Let f be a function such that f(ab)=f(a)+f(b) with f(1)=0 and derivative of f at 1 is 1
How can I show that f is continuous on every positive number and
derivative of f is 1x?
How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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