What is the integral of 1/(sqrt(x^2+9)) ?

The integral of 1/(sqrt(x^2+9)) is ln(1/3 |x+sqrt(9+x^2)|)+C

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integral of 1/(sqrt(x^2+9))

\int \frac{1}{x ^{2} + 9} d x

ln (\frac{1}{3} x + 9 + x^{2}) + C

Solution steps

\int \frac{1}{x ^{2} + 9} d x

Apply Trigonometric Substitution

: \int sec (u) d u

= \int sec (u) d u

Use the common integral:

\int sec (u) d u = ln ∣ tan (u) + sec (u) ∣

= ln ∣ tan (u) + sec (u) ∣

Substitute back

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

= ln tan (arctan (\frac{1}{3} x)) + sec (arctan (\frac{1}{3} x))

Simplify

ln tan (arctan (\frac{1}{3} x)) + sec (arctan (\frac{1}{3} x)) : ln (\frac{1}{3} x + 9 + x^{2})

= ln (\frac{1}{3} x + 9 + x^{2})

Add a constant to the solution

= ln (\frac{1}{3} x + 9 + x^{2}) + C

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What is the integral of 1/(sqrt(x^2+9)) ?
The integral of 1/(sqrt(x^2+9)) is ln(1/3 |x+sqrt(9+x^2)|)+C