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Integral of 2/((e^(-x))+1)

  • #1

Homework Statement





integral of 2/((e^(-x))+1)

Homework Equations



how do you do this?



The Attempt at a Solution



no freaking clue! this is the BS i came up with

2(x-ln(e^-x + 1) + C)
 

Answers and Replies

  • #2
56
0
You can rewrite the integrand and then use a simple substitution. Hint: multiply the numerator and denominator by e^x and then simplify.
 
Last edited:
  • #3
You can rewrite the integrand and then use a simple substitution. Hint: multiply the numerator and denominator by e^x and then simplify.
so then...i want to find the integral of e^x/(e^x + 1)...and i think i want to use substitution? u = e^x + 1. but then i do something wrong somewhere...i'm getting retarded answers...
 
  • #4
Cyosis
Homework Helper
1,495
0
If [itex]u=e^x+1[/itex] then du=?
 

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