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 ôif 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)ô,ëpô}) ¸
{1 (3+1)ø2
4 ë1}
¡ (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) ¸
5ì5ø2+(3ì5ø2)øi
¥¸ ë2.071…ì4.071…øi
rectangular
cylindrical
spherical