ASNG

Returns the arcsine of its argument, in gradians

Implemented by: bw32

With variations:

Also written as:

The return value of this function is in grads or gradians, according to the documentation source adopted, within the range -100 to 100, where -100 gradians is the same of -90 degrees and 100 gradians equals to 90 degrees.

For more on usage, see ASN.