Trigo; Trigsin; Trigtan - HP 48gII Advanced User's Reference Manual

Output: The transformed expression.
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).
See also: TRIG, TRIGSIN, TRIGTAN

TRIGO

Type: Command
Description: Displays a menu or list containing the CAS commands for transforming trigonometric
expressions.
Catalog, ...µ
Access:
Flags: If the CHOOSE boxes flag is clear (flag –117 clear), displays the operations as a numbered
list. If the flag is set, displays the operations as a menu of function keys.
See also: ALGB, ARIT, CONSTANTS, DIFF, EXP&LN, INTEGER, MAIN, MATHS, MATR,
MODULAR, POLYNOMIAL, REWRITE, TESTS

TRIGSIN

Type: Command
Description: Simplifies a trigonometric expression by applying the identity:
2
sin x +
Returns only sine terms if possible.
Trigonometry, ...ÑLL
Access:
Input: An expression with trigonometric terms.
Output: The transformed expression.
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).
See also: TRIG, TRIGCOS, TRIGTAN

TRIGTAN

Type: Command
Description: Replaces sine and cosine terms in a trigonometric expression with tangent terms.
Trigonometry, ...ÑLL
Access:
Input: An expression with trigonometric terms.
Output: The transformed expression.
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: Express the following in tan terms:
2
x
sin
Command:
TRIGTAN(SIN(X)^2)
Result:
TAN(X)^2/(TAN(X)^2+1)
See also: TRIG, TRIGCOS, TRIGSIN
4-76 Computer Algebra Commands
2
cos x = 1