Radio Shack TRS-80 PC-3 Owner's Manual page 178

COS is a numeric function which returns the cosine of the angle argument. The value returned depends on whether the PC-3
Computer is in decimal degree, radian, or gradient mode for angles. COS 60 is .5 in the decimal degree mode.
1 DEG numeric expression
The DEG function coverts an angle argument in DMS (Degree, Minute, Second) format to DEG (Decimal Degree) form. In DMS
format, the integer portion of the number represents the degrees, the first and second digits of the decimal represent the minutes,
the third and forth digits of the decimal represent the seconds, and any further digits represent decimal seconds. For example,
55° 10' 44.5" is represented as 55.10445. In DEG format, the integer portion is degrees and the decimal is decimal degrees. DEG
55.10445 is 55.17902778.
1 DMS numeric expression
DMS is a numeric function which converts an angle argument is DEG format to DMS format (see DEG). DMS 55.17902778 is
55.10445.
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