What is the integral from 0 to 1 of 1/(1+e^x) ?

The integral from 0 to 1 of 1/(1+e^x) is -ln(1+e)+ln(2)+1

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integral from 0 to 1 of 1/(1+e^x)

\int_{0}^{1} \frac{1}{1 + e ^{x}} d x

- ln (1 + e) + ln (2) + 1

Decimal

0.37988 \dots

Solution steps

\int_{0}^{1} \frac{1}{1 + e ^{x}} d x

\frac{1}{1 + e ^{x}} = - \frac{e ^{x}}{1 + e ^{x}} + 1

= \int_{0}^{1} - \frac{e ^{x}}{1 + e ^{x}} + 1 d x

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= - \int_{0}^{1} \frac{e ^{x}}{1 + e ^{x}} d x + \int_{0}^{1} 1 d x

\int_{0}^{1} \frac{e ^{x}}{1 + e ^{x}} d x = ln (1 + e) - ln (2)

\int_{0}^{1} 1 d x = 1

= - (ln (1 + e) - ln (2)) + 1

Simplify

= - ln (1 + e) + ln (2) + 1

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What is the integral from 0 to 1 of 1/(1+e^x) ?
The integral from 0 to 1 of 1/(1+e^x) is -ln(1+e)+ln(2)+1