Texas Instruments TI-73 EXPLORER - Manual (Page 217)

Chapter 11: Trigonometry
211
7311ENG.DOC CH 11 Trigonometry, English Julie Hewlett Revised: 05/26/98 11:12 AM Printed: 05/19/99 9:02
AM Page 211 of 12
Hint: This chapter’s section entitled “Graphing Trig
Functions” contains an example which graphs and traces
Y
1
=tan(X)
to show undefined Y values for the function.
Inverse Trig Functions Inverse Trig Functions - u 2, 4, and 6 2, 4, and 6
The inverse trig functions calculate the smallest angle that
gives a particular sine, cosine, or tangent. For example,
sin -1 (.5)
calculates the angle whose sine is .5.
sin -1 (
value
)
cos -1 (
value
)
tan -1 (
value
)
For
cos -1
(also called arccosine) and
sin -1
(also called arcsine),
M1value1.
All inverse trig functions return the arcsine, arccosine, or
arctangent of value or of each element in a list. If value is a
list, the calculator calculates the inverse trig function of each
element in the list, and a list is returned.
Angle Mode Settings Angle Mode Settings
In trig calculations, angles are interpreted as degrees ( ¡ ) or
radians ( r ), depending on the Angle mode setting,
Degree
or
Radian
.
Set the Angle mode from the mode screen.
.
Depending on the Angle mode, sin(1) is the sine of either 1 ¡ or
1 r . As you can see in the following illustration, 1 ¡ is not the
same as 1 r . Therefore, sin(1 ¡ ) ƒ sin(1 r ). For correct results,
enter angle values in the same units (degrees or radians) as the
Angle mode setting.