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Let f(x-y)=f(x).g(y)-f(y).g(x) and g(x-y...

Let `f(x-y)=f(x).g(y)-f(y).g(x) and g(x-y)=g(x).g(y)-f(x).g(y)` for all `x,y in R.` If right hand derivative at x = 0 exists for f(x), then derivative of g(x) at x = 0

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