Suppose f and g are functions having sec...

Suppose `f `and `g` are functions having second derivative `f''` and `g' '` everywhere. If `f(x)dotg(x)=1` for all `x` and `f^(prime)` and `g'` are never zero, then `(f^('')(x))/(f^(prime)(x))-(g^('')(x))/(g^(prime)(x))` is equal (a)`(-2f^(prime)(x))/f` (b) `(-2g^(prime)(x))/(g(x))` (c)`(-f^(prime)(x))/(f(x))` (d) `(2f^(prime)(x))/(f(x))`

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