Texpand – HP 49g Graphing Calculator User Manual
Page 186
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TEXPAND
Type:
Command
Description:
Expands transcendental fimctions.
Access:
Trigonometry, 0QlG)
Input:
An expression.
Output:
The transfonnation of the expression.
Flags:
Exact mode must be set (flag -105 clear).
Numeric mode must not be set (flag -03 clear).
Example:
Simplify the followmg expression:
ln(sin(.r-t-y))
Command:
TEXPAND ( L N ( S I N ( X - F Y ) ) )
Result:
L N ( C O S ( Y ) * S I N ( X ) + S I N ( Y ) * C O S ( X ) )
TUN
Type:
Commaiid
Description:
Linearizes and simplifies trigonometric expressions.
Note that this fimction does not collect sin and cos
terms of the same angle.
Access:
Trigonometry, 0(TR©
Input:
An expression.
Output:
The transfonnation of the expression.
Flags:
Exact mode must be set (flag -105 clear).
Numeric mode must not be set (flag -03 clear).
Example:
Linearize and simplify the following:
(
cos
(
a
'))'^
Command:
T L I N ( C O S ( X ) " 4 )
Result:
( 1 / 8 ) * C O S ( 4 X ) + ( 1 / 2 ) * C O S ( 2 X ) ( 3 / 8 )
Computer Algebra Commands
Page 14-63