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Dear Mohini
let e^x + 1=t
then e^x dx=dt
so dx/e^x+1=dt/e^x*t=dt/(t-1)t=dt/t-1-dt/t
∫dt/t-1-dt/t=ln(t-1/t)+c=ln(e^x/e^x + 1)+c
Good Luck
AskIITIANS Expert
Abhinav Batra
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