Texas TI-86 用户手册

20ATOZ.DOC   TI-86, Chap 20, US English   Bob Fedorisko   Revised: 02/13/01 2:42 PM   Printed: 02/13/01 3:05 PM   Page 276 of 118

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   or   

Returns the cosine of angle or expression, which can be
real or complex.

An angle is interpreted as degrees or radians according
to the current angle mode. In any angle mode, you can
designate an angle as degrees or radians by using the 

or 

 designator, respectively, from the 

MATH ANGLE

menu.

In 

 angle mode:

L

In 

 angle mode:

The squareMatrix cannot
have repeated
eigenvalues.

Returns a list in which each element is the cosine of the
corresponding element in list.

Returns a square matrix that is the matrix cosine of
squareMatrix

. The matrix cosine corresponds to the

result calculated using power series or Cayley-Hamilton
Theorem techniques. This is not the same as simply
calculating the cosine of each element.

In 

 angle mode:

L

In 

 angle mode:

-

 

|

   or   

Returns the arccosine of number or expression, which
can be real or complex.

In 

 angle mode:

L1

In 

 angle mode:

L1

Returns a list in which each element is the arccosine of
the corresponding element in list.

In 

 angle mode:

L1