HP HP-28S - Page 81

For example, you can define a function COT for the cotangent func-
tion,
where cot x = 1/tan x.
Begin the program.
o
Indicate the argument .
• G [ill x [ill
2: 0
1: 2.46855006079
«I
CIBImJIII:lI3IDD1G1l1m1IDI:l11
2: 0
1: 2.46855006079
« ~ xl
CIBImJIII:lI3IDD1G1l1m1IDI:l11
The right arrow indicates that the following name represents a local
variable, which will exist only within this program.
It's
useful to follow some convention to distinguish your local vari-
ables from your ordinary or Hglobal
H
variables. This manual uses
lower-case letters to
distinguish local variables. (Pressing [ill once
switches to lower case; pressing [ill a second time switches back to
upper case.)
Define
the function.
CJ .OEJ CO TAN CO I LC I x
Enter the program.
I ENTER I
2: 0
1: 2.46855006079
« ~ x' INV (TAN(xl
CIBImJIII:lI3IDD1G1l1m1IDI:l11
2: 2.46855006079
1: « ~ x 'INV(TAN(x»'
»
CIBImJIII:lI3IDD1G1l1m1IDI:l11
The closing parentheses and delimiters are added for you.
80 5: Real-Number Functions