What is the integral of 3/(xsqrt(x^2-9)) ?

The integral of 3/(xsqrt(x^2-9)) is arcsec(1/3 x)+C

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integral of 3/(xsqrt(x^2-9))

\int \frac{3}{x x ^{2} - 9} d x

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

Solution steps

\int \frac{3}{x x ^{2} - 9} d x

Take the constant out:

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

= 3 \cdot \int \frac{1}{x x ^{2} - 9} d x

Apply Trigonometric Substitution

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

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

Take the constant out:

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

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

Integral of a constant:

\int a d x = a x

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

Substitute back

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

= 3 \cdot \frac{1}{3} \cdot 1 \cdot arcsec (\frac{1}{3} x)

Simplify

3 \cdot \frac{1}{3} \cdot 1 \cdot arcsec (\frac{1}{3} x) : arcsec (\frac{1}{3} x)

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

Add a constant to the solution

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

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What is the integral of 3/(xsqrt(x^2-9)) ?
The integral of 3/(xsqrt(x^2-9)) is arcsec(1/3 x)+C