What is the integral of 3/(18+2t^2) ?

The integral of 3/(18+2t^2) is 1/2 arctan(1/3 t)+C

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integral of 3/(18+2t^2)

\int \frac{3}{18 + 2 t ^{2}} d t

\frac{1}{2} arctan (\frac{1}{3} t) + C

Solution steps

\int \frac{3}{18 + 2 t ^{2}} d t

Take the constant out:

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

= 3 \cdot \int \frac{1}{18 + 2 t ^{2}} d t

Apply Integral Substitution

= 3 \cdot \int \frac{1}{6 ( u ^{2} + 1 )} d u

Take the constant out:

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

= 3 \cdot \frac{1}{6} \cdot \int \frac{1}{u ^{2} + 1} d u

Use the common integral:

\int \frac{1}{u ^{2} + 1} d u = arctan (u)

= 3 \cdot \frac{1}{6} arctan (u)

Substitute back

u = \frac{2}{3 2} t

= 3 \cdot \frac{1}{6} arctan (\frac{2}{3 2} t)

Simplify

3 \cdot \frac{1}{6} arctan (\frac{2}{3 2} t) : \frac{1}{2} arctan (\frac{1}{3} t)

= \frac{1}{2} arctan (\frac{1}{3} t)

Add a constant to the solution

= \frac{1}{2} arctan (\frac{1}{3} t) + C

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What is the integral of 3/(18+2t^2) ?
The integral of 3/(18+2t^2) is 1/2 arctan(1/3 t)+C