Texas Instruments TI-86 - Manual (Page 288)

276
Chapter 20: A to Z Function and Instruction Reference
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
cos
>
cos angle or cos ( expression )
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 r designator, respectively, from the MATH ANGLE
menu.
In Radian angle mode:
cos p/2 b L .5
cos ( p/2) b 0
cos 45 ¡ b .707106781187
In Degree angle mode:
cos 45 b .707106781187
cos ( p/2) r b 0
The squareMatrix cannot
have repeated
eigenvalues.
cos list
Returns a list in which each element is the cosine of the
corresponding element in list.
cos squareMatrix
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 Radian angle mode:
cos {0, p/2,p} b {1 0 L 1}
In Degree angle mode:
cos {0,60,90} b {1 .5 0}
cos L 1
- |
cos L 1 number or cos L 1 ( expression )
Returns the arccosine of number or expression, which
can be real or complex.
In Radian angle mode:
cos L1 .5 b 1.0471975512
In Degree angle mode:
cos L1 1 b 0
cos L 1 list
Returns a list in which each element is the arccosine of
the corresponding element in list.
In Radian angle mode:
cos L1 {0,.5} b
{1.57079632679,1.047…