What is the integral of 1/(x^2sqrt(64x^2+81)) ?

The integral of 1/(x^2sqrt(64x^2+81)) is -(sqrt(81+64x^2))/(81x)+C

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integral of 1/(x^2sqrt(64x^2+81))

\int \frac{1}{x ^{2} 64 x ^{2} + 81} d x

- \frac{81 + 64 x ^{2}}{81 x} + C

Solution steps

\int \frac{1}{x ^{2} 64 x ^{2} + 81} d x

Apply Trigonometric Substitution

: \int \frac{8 sec ( u )}{81 tan ^{2} ( u )} d u

= \int \frac{8 sec ( u )}{81 tan ^{2} ( u )} d u

Take the constant out:

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

= \frac{8}{81} \cdot \int \frac{sec ( u )}{tan ^{2} ( u )} d u

Rewrite using trig identities

= \frac{8}{81} \cdot \int \frac{cos ( u )}{sin ^{2} ( u )} d u

Apply u-substitution

: \int \frac{1}{v ^{2}} d v

= \frac{8}{81} \cdot \int \frac{1}{v ^{2}} d v

Apply the Power Rule

: - \frac{1}{v}

= \frac{8}{81} (- \frac{1}{v})

Substitute back

= \frac{8}{81} (- \frac{1}{sin ( arctan ( \frac{8}{9} x ) )})

Simplify

\frac{8}{81} (- \frac{1}{sin ( arctan ( \frac{8}{9} x ) )}) : - \frac{81 + 64 x ^{2}}{81 x}

= - \frac{81 + 64 x ^{2}}{81 x}

Add a constant to the solution

= - \frac{81 + 64 x ^{2}}{81 x} + C

\frac{d y}{d x} = \frac{( x - 1 )}{y - 4}

y = \frac{1}{2} x + 8

f^{^{'}} (x) = x

\frac{d}{d x} (ln (- e^{- x} + e + 1))

\frac{d}{d x} (x^{4} (x - 2)^{2})

What is the integral of 1/(x^2sqrt(64x^2+81)) ?
The integral of 1/(x^2sqrt(64x^2+81)) is -(sqrt(81+64x^2))/(81x)+C