What is the integral of (x^2+3)/(x^6(x^2+1)) ?

The integral of (x^2+3)/(x^6(x^2+1)) is -2/x+2/(3x^3)-3/(5x^5)-2arctan(x)+C

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integral of (x^2+3)/(x^6(x^2+1))

\int \frac{x ^{2} + 3}{x ^{6} ( x ^{2} + 1 )} d x

- \frac{2}{x} + \frac{2}{3 x ^{3}} - \frac{3}{5 x ^{5}} - 2 arctan (x) + C

Solution steps

\int \frac{x ^{2} + 3}{x ^{6} ( x ^{2} + 1 )} d x

Take the partial fraction of

\frac{x ^{2} + 3}{x ^{6} ( x ^{2} + 1 )} : \frac{2}{x ^{2}} - \frac{2}{x ^{4}} + \frac{3}{x ^{6}} - \frac{2}{x ^{2} + 1}

= \int \frac{2}{x ^{2}} - \frac{2}{x ^{4}} + \frac{3}{x ^{6}} - \frac{2}{x ^{2} + 1} 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{2}{x ^{2}} d x - \int \frac{2}{x ^{4}} d x + \int \frac{3}{x ^{6}} d x - \int \frac{2}{x ^{2} + 1} d x

\int \frac{2}{x ^{2}} d x = - \frac{2}{x}

\int \frac{2}{x ^{4}} d x = - \frac{2}{3 x ^{3}}

\int \frac{3}{x ^{6}} d x = - \frac{3}{5 x ^{5}}

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

= - \frac{2}{x} - (- \frac{2}{3 x ^{3}}) - \frac{3}{5 x ^{5}} - 2 arctan (x)

Simplify

= - \frac{2}{x} + \frac{2}{3 x ^{3}} - \frac{3}{5 x ^{5}} - 2 arctan (x)

Add a constant to the solution

= - \frac{2}{x} + \frac{2}{3 x ^{3}} - \frac{3}{5 x ^{5}} - 2 arctan (x) + C

What is the integral of (x^2+3)/(x^6(x^2+1)) ?
The integral of (x^2+3)/(x^6(x^2+1)) is -2/x+2/(3x^3)-3/(5x^5)-2arctan(x)+C