Texas Instruments Titanium TI-89, User Manual

Page: 885 / 977

882 Appendix A: Functions and Instructions
ô
(radian)
MATH/Angle menu
expression1 ô
⇒
expression
list1 ô
⇒
list
matrix1 ô
⇒
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({0 ô ,( p /12) ô , ë p ô }) ¸
{
1
( 3+1) ø
2
4
ë
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 ... }
o
(angle)
2 ’
key
[
radius, o q
_
angle
]
⇒
vector (polar input)
[
radius, o q
_
angle,Z_coordinate
]
⇒
vector
(cylindrical input)
[
radius, o q
_
angle, o
f
_angle
]
⇒
vector
(spherical input)
Returns coordinates as a vector depending on the
Vector Format
mode setting: rectangular,
cylindrical, or spherical.
[5, o 60 ¡ , o 45 ¡ ] ¸
In Radian mode and vector format set to:
(
magnitude o angle
)
⇒
complexValue (polar input)
Enters a complex value in (r
o q
) polar form. The
angle
is interpreted according to the current Angle
mode setting.
In Radian angle mode and Rectangular complex
format mode:
5+3 i
ì
(10
o p
/4)
¸
5
ì
5
ø
2+(3
ì
5
ø
2)
ø i
¥¸ ë 2.071… ì 4.071… ø i
rectangular
cylindrical
spherical