What is the integral of (e^x)/((e^x+1)^8) ?

The integral of (e^x)/((e^x+1)^8) is -1/(7(e^x+1)^7)+C

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integral of (e^x)/((e^x+1)^8)

\int \frac{e ^{x}}{( e ^{x} + 1 ) ^{8}} d x

- \frac{1}{7 ( e ^{x} + 1 ) ^{7}} + C

Solution steps

\int \frac{e ^{x}}{( e ^{x} + 1 ) ^{8}} d x

Apply u-substitution

: \int \frac{1}{u ^{8}} d u

= \int \frac{1}{u ^{8}} d u

Apply the Power Rule

: - \frac{1}{7 u ^{7}}

= - \frac{1}{7 u ^{7}}

Substitute back

u = e^{x} + 1

= - \frac{1}{7 ( e ^{x} + 1 ) ^{7}}

Add a constant to the solution

= - \frac{1}{7 ( e ^{x} + 1 ) ^{7}} + C

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What is the integral of (e^x)/((e^x+1)^8) ?
The integral of (e^x)/((e^x+1)^8) is -1/(7(e^x+1)^7)+C