What is the integral of (9x)/(x^4+1) ?

The integral of (9x)/(x^4+1) is 9/2 arctan(x^2)+C

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integral of (9x)/(x^4+1)

\int \frac{9 x}{x ^{4} + 1} d x

\frac{9}{2} arctan (x^{2}) + C

Solution steps

\int \frac{9 x}{x ^{4} + 1} d x

Take the constant out:

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

= 9 \cdot \int \frac{x}{x ^{4} + 1} d x

Apply u-substitution

: \int \frac{1}{2 ( u ^{2} + 1 )} d u

= 9 \cdot \int \frac{1}{2 ( u ^{2} + 1 )} d u

Take the constant out:

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

= 9 \cdot \frac{1}{2} \cdot \int \frac{1}{u ^{2} + 1} d u

Use the common integral:

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

= 9 \cdot \frac{1}{2} arctan (u)

Substitute back

u = x^{2}

= 9 \cdot \frac{1}{2} arctan (x^{2})

Simplify

9 \cdot \frac{1}{2} arctan (x^{2}) : \frac{9}{2} arctan (x^{2})

= \frac{9}{2} arctan (x^{2})

Add a constant to the solution

= \frac{9}{2} arctan (x^{2}) + C

\int 9 - 7 x^{2} d x

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

\int \frac{5 x}{x ^{2} - x - 6} d x

\int x e^{5 x + 2} d x

\int \frac{1}{9 x ^{4} + x ^{2}} d x

What is the integral of (9x)/(x^4+1) ?
The integral of (9x)/(x^4+1) is 9/2 arctan(x^2)+C