HP 33s hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 97

Numbers in Equations You can enter any valid number in an equation except fractions and numbers that aren't base 10 numbers. Numbers are always shown using ALL display format, which displays up to 12 characters. To enter a number in an equation, you can use the standard number-entry keys, including , ^, and a. Press ^ only after you type one or more digits. Don't use ^ for subtraction. When you start entering the number, the cursor changes from "¾" to "_" to show numeric entry. The cursor changes back when you press a nonnumeric key. Functions in Equations You can enter many HP 33s functions in an equation. A complete list is given under "Equation Functions" later in this chapter. Appendix G, "Operation Index," also gives this information. When you enter an equation, you enter functions in about the same way you put them in ordinary algebraic equations: „ In an equation, certain functions are normally shown between their arguments, such as "+" and "÷". For such infix operators, enter them in an equation in the same order. „ Other functions normally have one or more arguments after the function name, such as "COS" and "LN". For such prefix functions, enter them in an equation where the function occurs - the key you press puts a left parenthesis after the function name so you can enter its arguments. If the function has two or more arguments, press § (on the separate them. key) to If the function is followed by other operations, press | ` to complete the function arguments. Entering and Evaluating Equations 6-5