# Simp2; Simplify - HP 48gII Advanced User's Reference Manual

Graphing calculator.

Input:
An algebraic expression.
Output:
A list containing, the points where the expression changes sign, and between each pair of
points, the sign of the expression between those points.
Flags:
Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag -3 clear).
Radians mode must be set (flag –17 set).
Example:
Show the ranges of values of x for which the expression 2-x
Command:
SIGNTAB(2 – X^2)
Result:
-
{ '
' – '- 2' + ' 2' – '+ ' }
TABVAR

## SIMP2

Type:
Command
Description:
Simplifies two objects by dividing them by their greatest common divisor.
Arithmetic, !Þ L
Access:
Input:
Level 2/Argument 1: The first object.
Level 1/Argument 2: The second object.
Output:
Level 2/Item 1: The first object divided by the greatest common divisor.
Level 1/Item 2: The second object divided by the greatest common divisor.
Flags:
Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag -3 clear).
Radians mode must be set (flag –17 set).
Example:
Divide the following expressions by their greatest common divisor:
3
2
x
+
6x
3
x
7x
Command:
SIMP2(X^3+6*X^2+11*X+6, X^3-7*X-6)
Result:
{X+3,X-3}
EGCD

### SIMPLIFY

Type:
Command
Description:
Simplifies an expression.
Access:
Input:
An expression
Output:
An equivalent simplified expression. SIMPLIFY follows an extensive built-in set of rules, but
these might not give exactly the simplification the user expects.
Flags:
Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag -3 clear).
Example:
Simplify
Command:
SIMPLIFY((SIN(3*X)+SIN(7*X))/SIN(5*X))
Result:
4*COS(X)^2 - 2
COLLECT, EXPAND
4-66 Computer Algebra Commands
+
11 x
+
6
6
L
REWRITE
SIN 3 X
+
SIN 7 X
--------------------------------------------------------- -
SIN 5 X
is positive and negative.
2