ASN

Returns the arcsine of its argument, in radians.

Implemented by: zx81, spectrum, BBC, bw32

With variations:

Also written as: ASIN, ARCSIN

ASN is also found, with this name, in historical implementations of BASIC for IBM System/360 and System/370, according to the documentation of Bywater BASIC 3.20.

The BASIC Cookbook points out that BASICs which don't implement the function can achieve the same results, for a given X argument, with the following formula:

ATN(X/SQR(X*X+1))

• ASND for a version that returns degrees
• ASNG for returns in gradians
• ARCSIN, ASIN

• TRACTON, Ken. The BASIC Cookbook, 1st edition. Tab Books. USA, 1978.