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

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

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

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

\frac{1}{2} ln ∣ x + 1 ∣ - \frac{1}{2} ln ∣ x - 1 ∣ - \frac{1}{x - 1} + C

Solution steps

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

Take the constant out:

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

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

Take the partial fraction of

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

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

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 2 (\int \frac{1}{4 ( x + 1 )} d x - \int \frac{1}{4 ( x - 1 )} d x + \int \frac{1}{2 ( x - 1 ) ^{2}} d x)

\int \frac{1}{4 ( x + 1 )} d x = \frac{1}{4} ln ∣ x + 1 ∣

\int \frac{1}{4 ( x - 1 )} d x = \frac{1}{4} ln ∣ x - 1 ∣

\int \frac{1}{2 ( x - 1 ) ^{2}} d x = - \frac{1}{2 ( x - 1 )}

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

Simplify

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

= \frac{1}{2} ln ∣ x + 1 ∣ - \frac{1}{2} ln ∣ x - 1 ∣ - \frac{1}{x - 1}

Add a constant to the solution

= \frac{1}{2} ln ∣ x + 1 ∣ - \frac{1}{2} ln ∣ x - 1 ∣ - \frac{1}{x - 1} + C

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