HP 49g+ - Manual (Page 131)

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2. To quickly select one of the numbered options in a menu list (or CHOOSE
box), simply press the number for the option in the keyboard. For
example, to select option 4. HYPERBOLIC.. in the MTH menu, simply
press
4.
Hyperbolic functions and their inverses
Selecting Option 4. HYPERBOLIC.. , in the MTH menu, and pressing @@OK@@,
produces the hyperbolic function menu:
The hyperbolic functions are:
Hyperbolic sine, SINH, and its inverse, ASINH or sinh -1
Hyperbolic cosine, COSH, and its inverse, ACOSH or cosh -1
Hyperbolic tangent, TANH, and its inverse, ATANH or tanh -1
This menu contains also the functions:
EXPM(x) = exp(x) – 1,
LNP1(x) = ln(x+1).
Finally, option 9. MATH, returns the user to the MTH menu.
For example, in ALG mode, the keystroke sequence to calculate, say,
tanh(2.5), is the following:
„´ Select MTH menu
4 @@OK@@ Select the 4. HYPERBOLIC.. menu
5 @@OK@@ Select the 5. TANH function
2.5` Evaluate tanh(2.5)
The screen shows the following output:
In the RPN mode, the keystrokes to perform this calculation are the following:
2.5` Enter the argument in the stack
„´ Select MTH menu