Texas Instruments Titanium TI-89 - Cos -1 Key; Cosh and Cosh -1 Math;Hyperbolic Menu

796 Appendix A: Functions and Instructions
cosê () ¥Rkey
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 a degree, gradian
or radian angle, according to the current angle
mode setting.
In Degree angle mode:
cosê (1) ¸ 0
In Gradian angle mode:
cosê (0) ¸ 100
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…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,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)}
coshê( squareMatrix1 ) ⇒
⇒⇒
⇒ squareMatrix
Returns the matrix inverse hyperbolic cosine of
squareMatrix1 . This is not the same as calculating
the inverse 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 and Rectangular complex
format mode:
coshê([1,5,3;4,2,1;6,ë2,1]) ¸






2.525…+1.734…ø i ë.009…ì 1.490…ø i …
.486…ì.725…ø
i 1.662…+.623…ø i …
ë.322…ì 2.083…ø
i 1.267…+1.790…ø i …