What is the integral of 1/3 e^{3y} ?

The integral of 1/3 e^{3y} is 1/9 e^{3y}+C

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integral of 1/3 e^{3y}

\int \frac{1}{3} e^{3 y} d y

\frac{1}{9} e^{3 y} + C

Solution steps

\int \frac{1}{3} e^{3 y} d y

Take the constant out:

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

= \frac{1}{3} \cdot \int e^{3 y} d y

Apply u-substitution

: \int e^{u} \frac{1}{3} d u

= \frac{1}{3} \cdot \int e^{u} \frac{1}{3} d u

Take the constant out:

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

= \frac{1}{3} \cdot \frac{1}{3} \cdot \int e^{u} d u

Use the common integral:

\int e^{u} d u = e^{u}

= \frac{1}{3} \cdot \frac{1}{3} e^{u}

Substitute back

u = 3 y

= \frac{1}{3} \cdot \frac{1}{3} e^{3 y}

Simplify

\frac{1}{3} \cdot \frac{1}{3} e^{3 y} : \frac{1}{9} e^{3 y}

= \frac{1}{9} e^{3 y}

Add a constant to the solution

= \frac{1}{9} e^{3 y} + C

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