What is the integral of 1/(9y) ?

The integral of 1/(9y) is 1/9 ln|y|+C

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integral of 1/(9y)

\int \frac{1}{9 y} d y

\frac{1}{9} ln ∣ y ∣ + C

Solution steps

\int \frac{1}{9 y} d y

Take the constant out:

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

= \frac{1}{9} \cdot \int \frac{1}{y} d y

Use the common integral:

\int \frac{1}{y} d y = ln (∣ y ∣)

= \frac{1}{9} ln ∣ y ∣

Add a constant to the solution

= \frac{1}{9} ln ∣ y ∣ + C

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