1.

If `I=inte^(-x)log(e^x+1)dx ,t h e nIe q u a l``a+(e^(-x)+1)log(e^x+1)+C``a+(e^x+1)log(e^x+1)+C``a-(e^(-x)+1)log(e^x+1)+C`none of theseA. `x+(e^(-x)+1)log(e^(x)+1)+C`B. `x+(e^(x)+1)log(e^(x)+1)+C`C. `x-(e^(-x)+1)log(e^(x)+1)+C`D. none of these

Answer» Correct Answer - C
`I=-e^(-x)log(e^(x)+1)+int(e^(-x)e^(x))/(e^(x)+1)dx `
`=-e^(-x)log(e^(x)+1)+int(e^(-x))/(e^(-x)+1)dx`
`=-e^(-x)log(e^(x)+1)-log(e^(-x)+1)+C`
`=-e^(-x)log(e^(x)+1)-log(1+e^(x))+x+C`
`=-(e^(-x)+1)log(e^(x)+1)+x+C`


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