Hp 48g Graphing Calculator Instrukcja Użytkownika Pobierz pdf (Strona 136)

100

101

Remember: Unless you surround functions in single-quotes (the ' ‘

tick-mark delimiters), the HP 48 assumes that you are using postfix

syntax whenever you invoke the name of a function and thus uses

(or attempts to use) objects from the stack as the arguments for the

function.

Expressions and Equations

An expression is an algebraic that does not contain an = function.

An equation is an algebraic that does contain an = function. For

example, ' :31H (b! > - ATAH < > +6*X ' is an expression, and

' Y=HTAH(£*b:)+6*X ‘ is an equation.

When you use an equation as the argument of a function, the function

is applied to both sides, and the result is also an equation. For

example, ' Y=Y ' SIN returns ' SIN (X ) =S IN ( Y > '.

In the HP 48, = generally means equating two expressions. The

DEFINE command (fi^fDEF)) interprets = differently—it stores the

expression on the right side of the equal sign in the name on the left

side (see 11-7 for more details).

Symbolic Constants

The HP 48 has five built-in constants that can be included in algebraic

expressions either as symbolic constants or as 12-digit numerical

approximations. The five constants are these:

■ 7T (:3, 14159265359), the ratio of a circle’s perimeter to its

diameter.

B e (2.71828182846), the natural logarithm base.

B I ((0, 1 >), the square root of (-1).

B MAXR (9.99999999999E499), the largest positive real number

representable by the HP 48.

fl MINR (1. E-499), the smallest positive real number representable

by the HP 48.

The five constants are available in both symbolic and numeric forms

in the MTH CONSTANTS menu, accessed by pressing (MTH) (NXT)

C 0 N 8 . Three of the constants can also be entered directly from the

main keyboard:

11-4 Using Mathematical Functions

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