What is the integral of 1/((x-1)(x+1)^3) ?

The integral of 1/((x-1)(x+1)^3) is 1/8 ln|x-1|-1/8 ln|x+1|+1/(4(x+1))+1/(4(x+1)^2)+C

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integral of 1/((x-1)(x+1)^3)

\int \frac{1}{( x - 1 ) ( x + 1 ) ^{3}} d x

\frac{1}{8} ln ∣ x - 1 ∣ - \frac{1}{8} ln ∣ x + 1 ∣ + \frac{1}{4 ( x + 1 )} + \frac{1}{4 ( x + 1 ) ^{2}} + C

Solution steps

\int \frac{1}{( x - 1 ) ( x + 1 ) ^{3}} d x

Take the partial fraction of

\frac{1}{( x - 1 ) ( x + 1 ) ^{3}} : \frac{1}{8 ( x - 1 )} - \frac{1}{8 ( x + 1 )} - \frac{1}{4 ( x + 1 ) ^{2}} - \frac{1}{2 ( x + 1 ) ^{3}}

= \int \frac{1}{8 ( x - 1 )} - \frac{1}{8 ( x + 1 )} - \frac{1}{4 ( x + 1 ) ^{2}} - \frac{1}{2 ( x + 1 ) ^{3}} 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

= \int \frac{1}{8 ( x - 1 )} d x - \int \frac{1}{8 ( x + 1 )} d x - \int \frac{1}{4 ( x + 1 ) ^{2}} d x - \int \frac{1}{2 ( x + 1 ) ^{3}} d x

\int \frac{1}{8 ( x - 1 )} d x = \frac{1}{8} ln ∣ x - 1 ∣

\int \frac{1}{8 ( x + 1 )} d x = \frac{1}{8} ln ∣ x + 1 ∣

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

\int \frac{1}{2 ( x + 1 ) ^{3}} d x = - \frac{1}{4 ( x + 1 ) ^{2}}

= \frac{1}{8} ln ∣ x - 1 ∣ - \frac{1}{8} ln ∣ x + 1 ∣ - (- \frac{1}{4 ( x + 1 )}) - (- \frac{1}{4 ( x + 1 ) ^{2}})

Simplify

= \frac{1}{8} ln ∣ x - 1 ∣ - \frac{1}{8} ln ∣ x + 1 ∣ + \frac{1}{4 ( x + 1 )} + \frac{1}{4 ( x + 1 ) ^{2}}

Add a constant to the solution

= \frac{1}{8} ln ∣ x - 1 ∣ - \frac{1}{8} ln ∣ x + 1 ∣ + \frac{1}{4 ( x + 1 )} + \frac{1}{4 ( x + 1 ) ^{2}} + C

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What is the integral of 1/((x-1)(x+1)^3) ?
The integral of 1/((x-1)(x+1)^3) is 1/8 ln|x-1|-1/8 ln|x+1|+1/(4(x+1))+1/(4(x+1)^2)+C