What is the integral of (3e^x)/(1+e^x) ?

The integral of (3e^x)/(1+e^x) is 3ln|1+e^x|+C

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integral of (3e^x)/(1+e^x)

\int \frac{3 e ^{x}}{1 + e ^{x}} d x

3 ln ∣ 1 + e^{x} ∣ + C

Solution steps

\int \frac{3 e ^{x}}{1 + e ^{x}} d x

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 3 \cdot \int \frac{e ^{x}}{1 + e ^{x}} d x

Apply u-substitution

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

= 3 \cdot \int \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 3 ln ∣ u ∣

Substitute back

u = 1 + e^{x}

= 3 ln ∣ 1 + e^{x} ∣

Add a constant to the solution

= 3 ln ∣ 1 + e^{x} ∣ + C

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What is the integral of (3e^x)/(1+e^x) ?
The integral of (3e^x)/(1+e^x) is 3ln|1+e^x|+C