Calculates the arc sine of a floating-point number.
long double asinl (long double);
d Floating-point number for which arc sine is to be computed
Abnormal: Domain error: Returns not-a-number.
A domain error occurs for a value of d not in the range [–1.0, +1.0].
The asin function returns the arc sine in the range [–π/2, +π/2] by the radian.
If the function call is replaced by code that uses a trigonometric function unit, the function might no longer be reentrant. For details, refer to the item about -tfu in the section on compile options.