Texas Instruments TITANIUM TI-89 - Manual (Page 868)

868 Appendix A: Functions and Instructions
sec LLLL1 () MATH/Trig menu
sec LLLL1 ( expression1 )
⇒ ⇒ ⇒ ⇒ expression
sec LLLL1 ( list1 ) ⇒ ⇒ ⇒ ⇒ list
Returns the angle whose secant is expression1 or
returns a list containing the inverse secants 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:
sec L 1 (1) ¸ 0
In Gradian angle mode:
sec L 1 ( 2 ) ¸ 50
In Radian angle mode:
sec L 1 ({1,2,5}) ¸
{ 0
p
3 cos
L 1 (1/5)}
sech() MATH/Hyperbolic menu
sech( expression1 )
⇒ ⇒ ⇒ ⇒ expression
sech( list1 )
⇒ ⇒ ⇒ ⇒ list
Returns the hyperbolic secant of expression1 or
returns a list containing the hyperbolic secants of
the
list1 elements.
sech(3) ¸
1
cosh(3)
sech({1,2.3,4}) ¸
{
1
cosh(1)
.198…
1
cosh(4)}
sech LLLL1 ()
MATH/Hyperbolic menu
sech LLLL1 ( expression1 ) ⇒ ⇒ ⇒ ⇒ expression
sech LLLL1 ( list1 )
⇒ ⇒ ⇒ ⇒ list
Returns the inverse hyperbolic secant of
expression1 or returns a list containing the
inverse hyperbolic secants of each element of
list1 .
In Radian angle and Rectangular complex
mode:
sech L 1 (1) ¸ 0
sech L 1 ({1,L2,2.1}) ¸
{0
(
2
¦ p
3 )
¦ i 1.074…
¦ i }
Send
CATALOG
Send list
CBL 2 é (Calculator-Based Laboratoryé) or
CBR é (Calculator-Based Rangeré) instruction.
Sends list to the link port.
Program segment:
©
:Send {1,0}
:Send {1,2,1}
©
SendCalc CATALOG
SendCalc var
Sends variable var to the link port, where another
unit linked to that port can receive the variable
value. The receiving unit must be on the Home
screen or must execute
GetCalc from a program.
If you send from a TI -89, TI-92 Plus, or
Voyage™ 200 to a TI -92, an error occurs if the
TI -92 executes GetCalc from a program. In this
case, the sending unit must use SendChat
instead.
Program segment:
©
:a+b! x
:SendCalc x
©