Texas Instruments TI-89 - Page 441

424 Appendix A: Functions and Instructions
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 424 of 132
cos
ê
()
TI
-
89:
¥R
key TI
-
92 Plus:
2R
key
cos
ê
(
expression1
)
⇒
expression
cos
ê
(
list1
)
⇒
list
cos
ê
(
expression1
)
returns the angle whose
cosine is
expression1
as an expression.
cos
ê
(
list1
)
returns a list of the inverse
cosines of each element of
list1
.
Note: The result is returned as either a
degree or radian angle, according to the
current angle mode setting.
In Degree angle mode:
cos
ê
(1)
¸
0
In Radian angle mode:
cos
ê
({0,.2,.5})
¸
{
p
2
1.369
...
1.047
...
}
cos
ê
(
squareMatrix1
)
⇒
squareMatrix
Returns the matrix inverse cosine of
squareMatrix1
. This is
not
the same as
calculating the inverse cosine of each
element. For information about the
calculation method, refer to
cos()
.
squareMatrix1
must be diagonalizable. The
result always contains floating-point
numbers.
In Radian angle mode and Rectangular
complex format mode:
cos
ê
([1,5,3;4,2,1;6,
ë
2,1])
¸






1.734…+.064…
ø
i
ë
1.490…+2.105…
ø
i
…
ë
.725…+1.515…
ø
i
.623…+.778…
ø
i
…
ë
2.083…+2.632…
ø
i
1.790…
ì
1.271…
ø
i
…
cosh()
MATH/Hyperbolic menu
cosh(
expression1
)
⇒
expression
cosh(
list1
)
⇒
list
cosh (
expression1
)
returns the hyperbolic
cosine of the argument as an expression.
cosh (
list1
)
returns a list of the hyperbolic
cosines of each element of
list1
.
cosh(1.2)
¸
1.810
...
cosh({0,1.2})
¸
{1 1.810
...
}
cosh(
squareMatrix1
)
⇒
squareMatrix
Returns the matrix hyperbolic cosine of
squareMatrix1
. This is
not
the same as
calculating the hyperbolic cosine of each
element. For information about the
calculation method, refer to
cos()
.
squareMatrix1
must be diagonalizable. The
result always contains floating-point
numbers.
In Radian angle mode:
cosh([1,5,3;4,2,1;6,
ë
2,1])
¸




421.255 253.909 216.905
327.635 255.301 202.958
226.297 216.623 167.628
cosh
ê
()
MATH/Hyperbolic menu
cosh
ê
(
expression1
)
⇒
expression
cosh
ê
(
list1
)
⇒
list
cosh
ê
(
expression1
)
returns the inverse
hyperbolic cosine of the argument as an
expression.
cosh
ê
(
list1
)
returns a list of the inverse
hyperbolic cosines of each element of
list1
.
cosh
ê
(1)
¸
0
cosh
ê
({1,2.1,3})
¸
{0 1.372
...
cosh
ê
(3)}