# Computer Algebra Commands; Introduction; Cas Operations - HP 48gII Advanced User's Reference Manual

Graphing calculator.

## 4.Computer Algebra Commands

### Introduction

The Computer Algebra System, or CAS, is a collection of operations that can be applied to algebraic
expressions.
The hp49g+/hp48gII operations can be used with numbers to produce numeric results, or with symbols to
produce algebraic expressions. Algebraic expressions and equations can be written using the Equation Writer
too. Algebraic expressions and symbolic operations on them, called computer algebra operations, are
introduced in Chapter 5 of the User's Manual.
Further explanations of computer algebra operations, are given in the User's Guide, whereas this part of the
Advanced User's Guide lists the computer algebra operations that can be applied to symbolic expressions, with
a description of each one listed.
These operations perform tasks such as rearrangement of trigonometric and logarithmic functions, or
manipulation of polynomials, series and matrices. They are referred to as the "Computer Algebra System" or
the CAS. Many of the CAS operations are of particular use in Linear Algebra applications and in Vector
Algebra. The CAS on the hp48gII and the hp49g+ allows these calculators to provide many of the features of
the Computer Algebra Systems used on laptop and desktop computers.
Note: The Computer Algebra System should not be confused with Algebraic mode, which is one of the
calculator's operating modes. The CAS works with algebraic (or symbolic) expressions, which can be entered
and used in Algebraic mode or in RPN mode.

### CAS Operations

This volume of the Command Reference lists CAS operations, first according to the menus they appear in,
then in detail, in alphabetic order. A few CAS operations appear in more than one menu. Some menus contain
CAS operations and also operations that are not part of the CAS. Operations that are not part of the CAS are
described in the full Command Reference in the previous chapter.
For each CAS operation in the alphabetical list, some or all of the following details are provided:
Type:
Function or command. Functions, for example LCM, can be part of an algebraic expression.
Commands, for example SOLVE, cannot. When working with functions or commands within
the Equation Writer:
When you apply a function to an expression, the function becomes part of the expression.
You need to ensure that the expression is selected, then press Nto apply the function
to the selection.
When you apply a command to an expression in Equation Writer, it is evaluated
immediately.
Description:
A description of the operation.
Access:
The menu or choose-list on which an operation can be found, and the keys that you press to
access it. If the operation is on a sub-menu, the sub-menu name is in
the keys.
CAS commands that are not in any of the other menus on the keyboard can be accessed from
the ...µ menu. Most CAS commands can also be accessed from the
SMALL CAPITALS
CASCMD
command.
Computer Algebra Commands 4-1
4
after
choose-