# Integrate problem?...?

Integrate: click site for problem: http://learningbygrace.org/calc/images/prob16.gif

Is it:

a.) 2 ln (1 + e^x) + C

b.) ln (1 + e^x) + C

c.) ln (e^x) + C

d.) 2 ln (1/2 + e^x) + C

### 1 Answer

Relevance

- anonymous89Lv 71 decade agoBest Answer
Hi,

∫ 2 dx / [e^(-x) + 1]

Multiply the numerator and denominator by e^x .

∫ 2 e^x dx / [1 + e^x]

Answer: a.) 2 ln (1 + e^x) + C

Hope this helps!

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