If F(x)=f(x)g(x) and f'(x)g'(x)=c, then ...

If `F(x)=f(x)g(x)` and `f'(x)g'(x)=c`, then `(F'''(x))/(F(x))` is equal to (where `f'(x)` denotes differentiation w.rt.`x` and `c` is constant)
`(i)` `(f')/(f)+(g')/(g)`
` (ii) (f'')/(f)+(g'')/(g)`
` (iii) (f''')/(f)-(g''')/(g)
`
` (iv) (f''')/(f)+(g''')/(g)`

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