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

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

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

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

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

Solution steps

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

Apply Integral Substitution

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

Take the constant out:

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

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

Use the common integral:

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

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

Substitute back

u = \frac{x}{3}

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

Add a constant to the solution

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

y = x^{3} - 3 x + 2, (3, 20)

y = \frac{1}{( 4 x ^{2} + 3 ) ^{5}}

\int (2 x^{3} + 5 x^{2} - 2 x + 7) d x

\frac{\partial}{\partial y} (x y + ln (\frac{x}{y}))

\int x^{4} d x

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