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

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  • 1 decade ago
    Best 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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