Primitive of Inverse Hyperbolic Cosine of x over a over x squared

Theorem

 * $\displaystyle \int \frac {\cosh^{-1} \dfrac x a \ \mathrm d x} {x^2} = \begin{cases}

\displaystyle \frac {-\cosh^{-1} \dfrac x a} x - \frac 1 a \ln \left({\frac {a + \sqrt {x^2 + a^2} } x}\right) & : \cosh^{-1} \dfrac x a > 0 \\ \displaystyle \frac {-\cosh^{-1} \dfrac x a} x + \frac 1 a \ln \left({\frac {a + \sqrt {x^2 + a^2} } x}\right) & : \cosh^{-1} \dfrac x a < 0 \\ \end{cases}$

Proof
With a view to expressing the primitive in the form:
 * $\displaystyle \int u \frac {\mathrm d v}{\mathrm d x} \ \mathrm d x = u v - \int v \frac {\mathrm d u}{\mathrm d x} \ \mathrm d x$

let:

and let:

Then:

Also see

 * Primitive of $\dfrac {\sinh^{-1} \frac x a} {x^2}$


 * Primitive of $\dfrac {\tanh^{-1} \frac x a} {x^2}$


 * Primitive of $\dfrac {\coth^{-1} \frac x a} {x^2}$