What is the integral of 1/(x^2sqrt(36x^2+121)) ?

The integral of 1/(x^2sqrt(36x^2+121)) is -(sqrt(121+36x^2))/(121x)+C

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integral of 1/(x^2sqrt(36x^2+121))

\int \frac{1}{x ^{2} 36 x ^{2} + 121} d x

- \frac{121 + 36 x ^{2}}{121 x} + C

Solution steps

\int \frac{1}{x ^{2} 36 x ^{2} + 121} d x

Apply Trigonometric Substitution

= \int \frac{6 sec ( u )}{121 tan ^{2} ( u )} d u

Take the constant out:

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

= \frac{6}{121} \cdot \int \frac{sec ( u )}{tan ^{2} ( u )} d u

Rewrite using trig identities

= \frac{6}{121} \cdot \int \frac{cos ( u )}{sin ^{2} ( u )} d u

Apply u-substitution

= \frac{6}{121} \cdot \int \frac{1}{v ^{2}} d v

Apply the Power Rule

= \frac{6}{121} (- \frac{1}{v})

Substitute back

= \frac{6}{121} (- \frac{1}{sin ( arctan ( \frac{6}{11} x ) )})

Simplify

\frac{6}{121} (- \frac{1}{sin ( arctan ( \frac{6}{11} x ) )}) : - \frac{121 + 36 x ^{2}}{121 x}

= - \frac{121 + 36 x ^{2}}{121 x}

Add a constant to the solution

= - \frac{121 + 36 x ^{2}}{121 x} + C

What is the integral of 1/(x^2sqrt(36x^2+121)) ?
The integral of 1/(x^2sqrt(36x^2+121)) is -(sqrt(121+36x^2))/(121x)+C