Hyperbolic Functions
by Daniel J. Bishop
PUBLIC DOMAIN

Yes, hyperbolic functions are built-in, but the only way to use them is to scroll though the catalog.  This program makes them easier to use.

To find the value of a hyperbolic function:
1. Run the HYPFN program.
2. Enter the argument for the function.
3. Select a function from the menu.
(In case you were wondering, it uses less memory to enter the argument before selecting the function.)

Example: Find the inverse hyperbolic secant of 1.

Run the HYPFN program.  You will be prompted for the value of X.  Type 1 and press ENTER.  You will see this menu:

HYP. FUNCTIONS
1:SINH(X)
2:COSH(X)
3:TANH(X)
4:COTH(X)
5:SECH(X)
6:CSCH(X)
7:INVERSE

Since you need to evaluate an inverse function, press 7.  You will see a similar menu for the inverse function.  Press 5.  The calculator will display 0, which is the value of sech-1(1).

The return value for all functions is stored in Ans.  To evaluate an expression like 1+cosh(2)/2, use HYPFN to evaluate cosh(2), then type

1+Ans/2

to evaluate the entire expression.

Questions?  Comments?  Suggestions?  E-mail me at danb2k@hotmail.com