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Suppose f and g are functions having second derivatives f'' and g'' every where, if f(x).g(x)=1 for all x and f' and g' are never zero, then f′′(x)f′(x)−g′′(x)g′(x) equals

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Suppose f and g are functions having second derivatives f'' and g'' every where, if f(x).g(x)=1 for all x and f' and g' are never zero, then f′′(x)f(x)g′′(x)g(x) equals



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