1.

Method of integration by parts : If int(xe^(x))/(sqrt(1+e^(x)))dx=f(x)sqrt(1+e^(x))-2logg(x)+c then .........

Answer»

`f(X)=x-1,g(x)=(SQRT(1+e^(x))+1)/(sqrt(1+e^(x))-1)`
`f(x)=2x-4,g(x)=(sqrt(1+e^(x))-1)/(sqrt(1+e^(x)+1))`
`f(x)=x-1,g(x)=(sqrt(1+e^(x))-1)/(sqrt(1+e^(x))+1)`
None of these

Answer :B


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