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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
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
...
}
(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+3
i
ì
(10p/4)
¸
5
ì
5
ø
2+(3
ì
5
ø
2)
ø
i
¥¸ ë
2.071…
ì
4.071…
ø
i
rectangular
cylindrical
spherical