JEE Advanced 2020 Full Test 5 Paper 2

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Question : 37 of 54

Marks: +1, -0

Suppose f and g are functions having second derivatives f′′ and g′′ everywhere, if f(x)g(x)=1 for all x and f′(x) and g′ are never zero, then ‌

f′′(x)

f′(x)

−‌

g′′(x)

g′(x)

equals

‌
f′(x)
f(x)
2‌
f′(x)
f(x)
−‌
2g′(x)
g(x)
−‌
2f′(x)
f(x)

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