What is the integral of 1/((xsqrt(x^2-9))) ?

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

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integral of 1/((xsqrt(x^2-9)))

\int \frac{1}{( x x ^{2} - 9 )} d x

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

Solution steps

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

Apply Trigonometric Substitution

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

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

Integral of a constant:

\int a d x = a x

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

Substitute back

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

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

Simplify

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

Add a constant to the solution

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

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