Texas Instruments PLUS TI-89 - Manual (Page 552)

Appendix A: Functions and Instructions 535
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 535 of 132
ô (radian) MATH/Angle menu
expression1ô ⇒ expression
list1ô
⇒
list
matrix1ô ⇒ matrix
In Degree angle mode, multiplies expression1
by 180/ p. In Radian angle mode, returns
expression1 unchanged.
This function gives you a way to use a radian
angle while in Degree mode. (In Degree angle
mode,
sin() , cos() , tan() , and polar-to-
rectangular conversions expect the angle
argument to be in degrees.)
Hint: Use ô if you want to force radians in a
function or program definition regardless of
the mode that prevails when the function or
program is used.
In Degree or Radian angle mode:
cos(( p/4)ô ) ¸
‡2
2
cos({0ô,( p/12)ф,л pф }) ¸
{ 1
( 3+1)ш 2
4
л 1 }
¡ (degree) 2 “ key
expression ¡ ⇒
value
list1 ¡ ⇒ list
matrix1 ¡ ⇒
matrix
In Radian angle mode, multiplies expression
by p/180. In Degree angle mode, returns
expression unchanged.
This function gives you a way to use a degree
angle while in Radian mode. (In Radian angle
mode,
sin() , cos() , tan() , and polar-to-
rectangular conversions expect the angle
argument to be in radians.)
In Radian angle mode:
cos(45 ¡) ¸
‡2
2
cos({0, p/4,90¡,30.12¡}) ¥ ¸
{1 .707... 0 .864...}

(angle) 2 ’ key
[ radius, q _ angle ] ⇒ vector (polar input)
[ radius, q _ angle,Z_coordinate ] ⇒ vector
(cylindrical input)
[ radius, q _ angle,  f_angle ] ⇒ vector
(spherical input)
Returns coordinates as a vector depending
on the
Vector Format mode setting:
rectangular, cylindrical, or spherical.
[5, 60¡,45¡] ¸
In Radian mode and vector format set to:
( magnitude  angle ) ⇒
complexValue (polar input)
Enters a complex value in (r q) polar form.
The angle is interpreted according to the
current Angle mode setting.
In Radian angle mode and Rectangular
complex format mode:
5+3iì (10 p/4) ¸
5м 5ш 2+(3м 5ш 2)шi
¥¸ л 2.071…м 4.071…шi
rectangular
cylindrical
spherical