Hp 49g Graphing Calculator Manuel d'utilisateur télécharger pdf (Page 62)

Using Equation Writer

As you create or edit an expression, keep the following points in mind:

® You use the operators and the fimctions from the keyboard to specify

the operations that your expression contains. For example, to include

an arithmetic addition, press ©. To include a sine function, press (SIN).

® By default, any operation you select is applied to the fimction or tenn

immediately to the left of the cursor. You press ® to extend the

selection on the left to which the next operation will apply.

Implied multiplication

You normally press ® to specify multiplication. However, for certain

expressions. Equation Writer assumes that multiplication is intended and

you do not need to specify it. This is the case in the following situations:

» a number followed by a letter, for example 2x

• a number or letter followed by an opening parenthesis

• a number or letter followed by a prefix function, that is a function

where the arguments appear after the name, for example sin(.r).

• a right parenthesis followed by a left parenthesis.

Entering e and /

To enter the value e, the base for natural logarithms, or i, the square root

of-1, you can simply use the alpha keys to enter lower-case e or i. That is:

• to enter e, press (SM)Rle

® to enter i, press (S|HA)0i.

In algebraic expressions, the HP 49G recognizes these letters as the

equivalent values.

You can also enter i by pressing 0®.

Page 3-4 Creating and editing expressions

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Hp 49g Graphing Calculator Manuel d'utilisateur Page 62