What is the integral of (e^{4x})/(1+e^{8x)} ?

The integral of (e^{4x})/(1+e^{8x)} is 1/4 arctan(e^{4x})+C

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integral of (e^{4x})/(1+e^{8x)}

\int \frac{e ^{4 x}}{1 + e ^{8 x}} d x

\frac{1}{4} arctan (e^{4 x}) + C

Solution steps

\int \frac{e ^{4 x}}{1 + e ^{8 x}} d x

Apply u-substitution

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

Take the constant out:

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

= \frac{1}{8} \cdot \int \frac{1}{u u - 1} d u

Apply u-substitution

= \frac{1}{8} \cdot \int \frac{2}{v ^{2} + 1} d v

Take the constant out:

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

= \frac{1}{8} \cdot 2 \cdot \int \frac{1}{v ^{2} + 1} d v

Use the common integral:

\int \frac{1}{v ^{2} + 1} d v = arctan (v)

= \frac{1}{8} \cdot 2 arctan (v)

Substitute back

= \frac{1}{8} \cdot 2 arctan (1 + e^{8 x} - 1)

Simplify

\frac{1}{8} \cdot 2 arctan (1 + e^{8 x} - 1) : \frac{1}{4} arctan (e^{4 x})

= \frac{1}{4} arctan (e^{4 x})

Add a constant to the solution

= \frac{1}{4} arctan (e^{4 x}) + C

What is the integral of (e^{4x})/(1+e^{8x)} ?
The integral of (e^{4x})/(1+e^{8x)} is 1/4 arctan(e^{4x})+C