Radio Shack TRS-80 Model 3 - Page 250

TRS-80 MODEL III
Other values which are not available from these functions are:
ARSCIN (- 1) - PI ; 2
ARCSIN (
1) = PI ; 2
ARCCOS (
- 1) PI
ARCCOS ( 1) = a
ARCSEC (- 1) = - PI
ARCSEC ( 1) = a
ARCCSC (-1) = - PI; 2
ARCCSC (
1) = PI ; 2
Please note that the above information may not be exhaustive.
E/2