What is the integral of (2u)/(u^2+4) ?

The integral of (2u)/(u^2+4) is ln|u^2+4|+C

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integral of (2u)/(u^2+4)

\int \frac{2 u}{u ^{2} + 4} d u

ln u^{2} + 4 + C

Solution steps

\int \frac{2 u}{u ^{2} + 4} d u

Take the constant out:

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

= 2 \cdot \int \frac{u}{u ^{2} + 4} d u

Apply u-substitution

: \int \frac{1}{2 v} d v

= 2 \cdot \int \frac{1}{2 v} d v

Take the constant out:

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

= 2 \cdot \frac{1}{2} \cdot \int \frac{1}{v} d v

Use the common integral:

\int \frac{1}{v} d v = ln (∣ v ∣)

= 2 \cdot \frac{1}{2} ln ∣ v ∣

Substitute back

v = u^{2} + 4

= 2 \cdot \frac{1}{2} ln u^{2} + 4

Simplify

2 \cdot \frac{1}{2} ln u^{2} + 4 : ln u^{2} + 4

= ln u^{2} + 4

Add a constant to the solution

= ln u^{2} + 4 + C

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