Trigonometric Functions for the HP-38C/HP-12C

[Gerson W. Barbosa]

These might give maximum absolute errors around 1.2E-10 and 8.8E-10 for sine and arctangent, respectively:

+1.74532925199433E-02 STO 0
-3.33332558903409E-01 STO 1
+1.99913266300000E-01 STO 2
-1.40254920000000E-01 STO 3
-8.86096146249340E-07 STO 4
+1.34958277500000E-11 STO 5
-9.73259000000000E-17 STO 6

P.S.: I will check the arctangent constants later.

.9999 GTO 39 R/S --> 89.18970856 asin ok
.9999 GTO 46 R/S --> 0.8102914371 acos ok
.9999 GTO 52 R/S --> 44.997(06196)

P.P.S.: These are better:

-0.3333323779 STO 1
0.19987227 STO 2
-0.139705 STO 3

1 GTO 52 R/S --> 45.00000(288)
.9999 GOTO 52 R/S --> 44.99713(794)
.9 GOT0 52 R/S --> 41.98721(134)