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- 'Date: 03-24-92 (16:16)
- 'From: DAVID WILLIAMS
- 'Subj: INVERTING 'COS'
- '-------------------------------------------------------------------------
- 'PI=4*ATN(1)
- 'DEF FNARCSIN(X)=ATN(X/SQR(1-X*X))
- 'DEF FNARCCOS(X)=PI/2-FNARCSIN(X)
-
- 'These will give you the arc-cosine (or the arc-sine) of any number that
- 'is LESS than one and GREATER than -1. If you think you will ever get the
- 'exact values 1 or -1, which are legal arguments for the functions but
- 'which produce a "divide by zero" error in FNARCSIN, you must take care
- 'to trap them out and treat them separately.
-
- 'The results are in radians. If you want degrees, multiply by 180/PI.
-