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
cosê() TI-89: ¥Rkey TI-92 Plus: 2Rkey
cosê(expression1) ⇒ expression
cosê(list1) ⇒ list
cosê(expression1) returns the angle whose
cosine is expression1 as an expression.
cosê(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...}
cosê(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,ë2,1])
¸
1.734…+.064…øi ë1.490…+2.105…øi …
ë.725…+1.515…øi .623…+.778…øi …
ë2.083…+2.632…øi 1.790…ì1.271…øi …
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,ë2,1])
¸
421.255 253.909 216.905
327.635 255.301 202.958
226.297 216.623 167.628
coshê() MATH/Hyperbolic menu
coshê(expression1) ⇒ expression
coshê(list1) ⇒ list
coshê(expression1) returns the inverse
hyperbolic cosine of the argument as an
expression.
coshê(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)}