public static native double asin (double a)

Returns the arc sine of a value; the returned angle is in the
range -*pi*/2 through *pi*/2. Special cases:

- If the argument is NaN or its absolute value is greater than 1, then the result is NaN.
- If the argument is zero, then the result is a zero with the same sign as the argument.

`a` | the value whose arc sine is to be returned. |

Diagram: Math