Texas Instruments PLUS TI-89 - Manual (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: 2 R 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:
cosê (1) ¸ 0
In Radian angle mode:
cosê ({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:
cosê([1,5,3;4,2,1;6,л 2,1])
¸





 1.734…+.064…шi л 1.490…+2.105…шi …
л.725…+1.515…шi .623…+.778…øi …
л 2.083…+2.632…шi 1.790…м 1.271…шi …
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 .
coshê (1) ¸ 0
coshê ({1,2.1,3}) ¸
{0 1.372... coshê (3)}