+ Cos, Sin, Tan, Acos, Asin, Atan,
+ Ln, Log, Exp,
+ Erfc, Erf,
+ Abs, Ceil, Floor,
+ Store, Recall, Inc, Dec, Disp, Mem, Clear,
+ Quit, Help,
+ Ans, E, Pi,
+ Equal, Diff, Ge, Le, Gt, Lt,
+ And, Or, Not,
+ Cond, While, Code, Print,
+ Prog, Call, List, Edit, Del