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Let f(x)a n dg(x) be two function having...

Let `f(x)a n dg(x)` be two function having finite nonzero third-order derivatives `f'''(x)` and `g'''(x)` for all `x in R`. If `f(x).g(x)=1` for all `x in R ,` then prove that `(f''')/(f') - (g''')/(g') = 3((f'')/f - (g'')/g)`.

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