What is the integral of (4x)/(1-x^2) ?

The integral of (4x)/(1-x^2) is -2ln|1-x^2|+C

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integral of (4x)/(1-x^2)

\int \frac{4 x}{1 - x ^{2}} d x

- 2 ln 1 - x^{2} + C

Solution steps

\int \frac{4 x}{1 - x ^{2}} d x

Take the constant out:

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

= 4 \cdot \int \frac{x}{1 - x ^{2}} d x

Apply u-substitution

= 4 \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

= 4 (- \frac{1}{2} \cdot \int \frac{1}{u} d u)

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= 4 (- \frac{1}{2} ln ∣ u ∣)

Substitute back

u = 1 - x^{2}

= 4 (- \frac{1}{2} ln 1 - x^{2})

Simplify

4 (- \frac{1}{2} ln 1 - x^{2}) : - 2 ln 1 - x^{2}

= - 2 ln 1 - x^{2}

Add a constant to the solution

= - 2 ln 1 - x^{2} + C

What is the integral of (4x)/(1-x^2) ?
The integral of (4x)/(1-x^2) is -2ln|1-x^2|+C