What is the integral of (2x)/((x^2+1)ln(x^2+1)) ?

The integral of (2x)/((x^2+1)ln(x^2+1)) is ln|ln(x^2+1)|+C

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

integral of (2x)/((x^2+1)ln(x^2+1))

\int \frac{2 x}{( x ^{2} + 1 ) ln ( x ^{2} + 1 )} d x

ln ln (x^{2} + 1) + C

Solution steps

\int \frac{2 x}{( x ^{2} + 1 ) ln ( x ^{2} + 1 )} d x

Take the constant out:

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

= 2 \cdot \int \frac{x}{( x ^{2} + 1 ) ln ( x ^{2} + 1 )} d x

Apply u-substitution

= 2 \cdot \int \frac{1}{2 u ln ( u )} d u

Take the constant out:

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

= 2 \cdot \frac{1}{2} \cdot \int \frac{1}{u ln ( u )} d u

Apply u-substitution

= 2 \cdot \frac{1}{2} \cdot \int \frac{1}{v} d v

Use the common integral:

\int \frac{1}{v} d v = ln (∣ v ∣)

= 2 \cdot \frac{1}{2} ln ∣ v ∣

Substitute back

= 2 \cdot \frac{1}{2} ln ln (x^{2} + 1)

Simplify

2 \cdot \frac{1}{2} ln ln (x^{2} + 1) : ln ln (x^{2} + 1)

= ln ln (x^{2} + 1)

Add a constant to the solution

= ln ln (x^{2} + 1) + C

What is the integral of (2x)/((x^2+1)ln(x^2+1)) ?
The integral of (2x)/((x^2+1)ln(x^2+1)) is ln|ln(x^2+1)|+C