मान लीजिए कि f(x +y) = f(x) f(y) और f(x)...

मान लीजिए कि `f(x +y) = f(x) f(y)` और `f(x) = 1 + xg(x) phi (x)` है, जहाँ `underset(xrarr0)"lim"g(x) = a`और `underset(xrarr0)"lim" phi (x) = b` है । तब `f'(x)` किसके बराबर है ?

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