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

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

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

\int \frac{2 x}{x ^{2} + 1} d x

ln x^{2} + 1 + C

Solution steps

\int \frac{2 x}{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} d x

Apply u-substitution

: \int \frac{1}{2 u} d u

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 2 \cdot \frac{1}{2} ln ∣ u ∣

Substitute back

u = x^{2} + 1

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

Simplify

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

= ln x^{2} + 1

Add a constant to the solution

= ln x^{2} + 1 + C

(12 - x) y^{2} = x^{3}, (6, 6)

\int (4 x^{3} + 2 x y^{2}) d x

x^{2} y^{^{'}} + 2 x y = ln (x)

\int \frac{x}{2 x + 3} d x

f (x) = \frac{x}{7 x ^{2} + 1}

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