What is the integral of k/(xln(x)) ?

The integral of k/(xln(x)) is kln|ln(x)|+C

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integral of k/(xln(x))

\int \frac{k}{x ln ( x )} d x

k ln ∣ ln (x) ∣ + C

Solution steps

\int \frac{k}{x ln ( x )} d x

Take the constant out:

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

= k \cdot \int \frac{1}{x ln ( x )} d x

Apply u-substitution

: \int \frac{1}{u} d u

= k \cdot \int \frac{1}{u} d u

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= k ln ∣ u ∣

Substitute back

u = ln (x)

= k ln ∣ ln (x) ∣

Add a constant to the solution

= k ln ∣ ln (x) ∣ + C

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