HP HP-28S - Page 82

This program means: take an argument from the stack (in RPN syn-
tax) or from the expression (in algebraic syntax) and call it x; then
evaluate the expression Iltan x, using the local definition of x.
Store the program in a variable COT.
CJ COT 1 STO I '-:;:3:-:-: ---~2~.-=0~6 7=-6-:--'1=-=5=3=7=35=7=E=---:"1"=3
2: 0
1: 2.46855006079
CIBIliIUIIlCEIDaIlIillUlGII:m
Now you can use COT in either RPN or algebraic syntax, just like the
built-in trigonometric functions.
Calculate cot
45° using RPN.
.1 MODE 1 DEG
45 1 USER 1 COT
3: 0
2: 2.46855006079
1: 1
.. m. ... IEJlI __
Calculate cot -45° using algebraic syntax.
CJ co T rn -45 I ENTER I =3-: ------=2,-."""'4-='6"="8=55=0=-0=-6""'0=-=7::-::"1
9
2: 1
Evaluate the expression.
I EVALI
1: 'COT(-45),
.. m. ... IEJlI __
3: 2.46855006079
2: 1
1: -1
.. m. ... IEJlI __
5: Real-Number Functions 81