What is the integral of 1/(3+5x^2) ?

The integral of 1/(3+5x^2) is 1/(sqrt(15))arctan(sqrt(5/3)x)+C

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integral of 1/(3+5x^2)

\int \frac{1}{3 + 5 x ^{2}} d x

\frac{1}{15} arctan (\frac{5}{3} x) + C

Solution steps

\int \frac{1}{3 + 5 x ^{2}} d x

Apply Integral Substitution

= \int \frac{1}{15 ( 1 + u ^{2} )} d u

Take the constant out:

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

= \frac{1}{15} \cdot \int \frac{1}{1 + u ^{2}} d u

Use the common integral:

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

= \frac{1}{15} arctan (u)

Substitute back

u = \frac{5}{3} x

= \frac{1}{15} arctan (\frac{5}{3} x)

Combine same powers :

\frac{x}{y} = \frac{x}{y}

= \frac{1}{15} arctan (\frac{5}{3} x)

Add a constant to the solution

= \frac{1}{15} arctan (\frac{5}{3} x) + C

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What is the integral of 1/(3+5x^2) ?
The integral of 1/(3+5x^2) is 1/(sqrt(15))arctan(sqrt(5/3)x)+C