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Suppose f and g are functions having second derivative f'' and g'' respectively at all points. 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

A
2f(x)f(x)
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B
2g(x)g(x)
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C
2f(x)f(x)
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D
2f(x)f(x)
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