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Question

If ddxf(x)=g(x) then baf(x)g(x)dx=

A
f(b)f(a)2
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B
f(a)f(b)2
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C
f2(b)f2(a)2
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D
f2(a)f2(b)2
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Solution

The correct option is A f2(b)f2(a)2
ddxf(x)=g(x) (given)
g(x)=f(x)
Ibaf(x)g(x)dx
I II
I =f(x)g(x)dx[ddxf(x)×g(x)dx]dx
I =f(x)f(x)bag(x)+f(x)dx
I =[f2(x)]baI
=2I=[f2(x)]ba
I=12[f2(x)]ba=[f2(b)f2(a)]2

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