HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 126
Calculation with real numbers, Checking calculators settings
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Chapter 3 Calculation with real numbers This chapter demonstrates the use of the calculator for operations and functions related to real numbers. Operations along these lines are useful for most common calculations in the physical sciences and engineering. The user should be acquainted with the keyboard to identify certain functions available in the keyboard (e.g., SIN, COS, TAN, etc.). Also, it is assumed that the reader knows how to adjust the calculator's operation, i.e., select operating mode (see Chapter 1), use menus and choose boxes (see Chapter 1), and operate with variables (see Chapter 2). Checking calculators settings To check the current calculator and CAS settings you need to just look at the top line in the calculator display in normal operation. For example, you may see the following setting: RAD XYZ DEC R = 'X' This stands for RADians for angular measurements, XYZ for Rectangular (Cartesian) coordinates, DECimal number base, Real numbers preferred, = means "exact" results, and 'X' is the value of the default independent variable. Another possible listing of options could be DEG R∠Z HEX C ~ 't' This stands for DEGrees as angular measurements, R∠Z for Polar coordinates, HEXagesimal number base, Complex numbers allowed, ~ stands for "approximate" results, and 't' as the default independent variable. In general, this part of the display contains seven elements. Each element is identified next under numbers 1 through 7. The possible values for each element are shown between parentheses following the element description. The explanation of each of those values is also shown: 1. Angle measure specification (DEG, RAD, GRD) DEG: degrees, 360 degrees in a complete circle RAD: radians, 2π radians in a complete circle GRD: grades, 400 grades in a complete circle Page 3-1
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