Integral of arcsin(x)/(xx) dx

1. Use integration by parts:

   $$\int \operatorname{u} \operatorname{dv} = \operatorname{u}\operatorname{v} - \int \operatorname{v} \operatorname{du}$$

   Let $u{\left(x \right)} = \operatorname{asin}{\left(x \right)}$ and let $\operatorname{dv}{\left(x \right)} = \frac{1}{x^{2}}$.

   Then $\operatorname{du}{\left(x \right)} = \frac{1}{\sqrt{1 - x^{2}}}$.

   To find $v{\left(x \right)}$:

   1. The integral of $x^{n}$ is $\frac{x^{n + 1}}{n + 1}$ when $n \neq -1$:

      $$\int \frac{1}{x^{2}}\, dx = - \frac{1}{x}$$

   Now evaluate the sub-integral.

2. The integral of a constant times a function is the constant times the integral of the function:

   $$\int \left(- \frac{1}{x \sqrt{1 - x^{2}}}\right)\, dx = - \int \frac{1}{x \sqrt{1 - x^{2}}}\, dx$$

   1. Don't know the steps in finding this integral.

      But the integral is

      $$\begin{cases} - \operatorname{acosh}{\left(\frac{1}{x} \right)} & \text{for}\: \frac{1}{\left|{x^{2}}\right|} > 1 \\i \operatorname{asin}{\left(\frac{1}{x} \right)} & \text{otherwise} \end{cases}$$

   So, the result is: $- \begin{cases} - \operatorname{acosh}{\left(\frac{1}{x} \right)} & \text{for}\: \frac{1}{\left|{x^{2}}\right|} > 1 \\i \operatorname{asin}{\left(\frac{1}{x} \right)} & \text{otherwise} \end{cases}$

3. Now simplify:

   $$\begin{cases} - (\operatorname{acosh}{\left(\frac{1}{x} \right)} + \frac{\operatorname{asin}{\left(x \right)}}{x}) & \text{for}\: \frac{1}{\left|{x^{2}}\right|} > 1 \\i \operatorname{asin}{\left(\frac{1}{x} \right)} - \frac{\operatorname{asin}{\left(x \right)}}{x} & \text{otherwise} \end{cases}$$

4. Add the constant of integration:

   $$\begin{cases} - (\operatorname{acosh}{\left(\frac{1}{x} \right)} + \frac{\operatorname{asin}{\left(x \right)}}{x}) & \text{for}\: \frac{1}{\left|{x^{2}}\right|} > 1 \\i \operatorname{asin}{\left(\frac{1}{x} \right)} - \frac{\operatorname{asin}{\left(x \right)}}{x} & \text{otherwise} \end{cases}+ \mathrm{constant}$$

The answer is:

$$\begin{cases} - (\operatorname{acosh}{\left(\frac{1}{x} \right)} + \frac{\operatorname{asin}{\left(x \right)}}{x}) & \text{for}\: \frac{1}{\left|{x^{2}}\right|} > 1 \\i \operatorname{asin}{\left(\frac{1}{x} \right)} - \frac{\operatorname{asin}{\left(x \right)}}{x} & \text{otherwise} \end{cases}+ \mathrm{constant}$$