Texas Instruments TI-89 Manual Book page 552

ô
(radian)
MATH/Angle menu
expression1ô
list1ô list
matrix1ô
In Degree angle mode, multiplies
by 180/p. In Radian angle mode, returns
expression1
This function gives you a way to use a radian
angle while in Degree mode. (In Degree angle
mode,
sin()
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.
¡
2 "
(degree) key
expression¡
list1¡ list
matrix1¡ matrix
In Radian angle mode, multiplies
by p/180. In Degree angle mode, returns
expression
This function gives you a way to use a degree
angle while in Radian mode. (In Radian angle
mode,
sin()
rectangular conversions expect the angle
argument to be in radians.)

2 '
key
(angle)
[radius,q_angle]
[radius,q_angle,Z_coordinate]
(cylindrical input)
[radius,q_angle, f _angle]
(spherical input)
Returns coordinates as a vector depending
on the
Vector Format
rectangular, cylindrical, or spherical.
(magnitude  angle)
Enters a complex value in (rq) polar form.
The
angle
current Angle mode setting.
expression
matrix
unchanged.
, , , and polar-to-
cos() tan()
value
unchanged.
, , , and polar-to-
cos() tan()
vector (polar input)
vector
vector
mode setting:
complexValue (polar input)
is interpreted according to the
In Degree or Radian angle mode:
cos((p/4)ô ) ¸
expression1
cos({0ô,(p/12)ô,ë pô }) ¸
In Radian angle mode:
cos(45¡) ¸
expression cos({0,p/4,90¡,30.12¡}) ¥ ¸
[5,60¡,45¡] ¸
In Radian mode and vector format set to:
In Radian angle mode and Rectangular
complex format mode:
5+3iì (10p/4) ¸
¥¸
Appendix A: Functions and Instructions
‡2
2
( 3 +1)ø 2
{ }
ë 1
1
4
‡2
2
{1 .707... 0 .864...}
rectangular
cylindrical
spherical
5ì 5ø 2+(3ì 5ø 2)øi
ë 2.071...ì 4.071...øi
535