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

The integral of (1/(x+1)) is ln|x+1|+C

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integral of (1/(x+1))

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

ln ∣ x + 1 ∣ + C

Solution steps

\int \frac{1}{x + 1} d x

Apply u-substitution

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

Use the common integral:

\int \frac{1}{u} d u = ln (∣ u ∣)

= ln ∣ u ∣

Substitute back

u = x + 1

= ln ∣ x + 1 ∣

Add a constant to the solution

= ln ∣ x + 1 ∣ + C