Texas Instruments TI-92 Getting Started page 22

5.4.1 Degrees and Radians: The trigonometric functions can be applied to angles measured either in radians or
degrees, but you should take care that the TI-92 is configured for whichever measure you need. Press MODE to see
the current settings. Press
angle measure is selected. Then press
Either press the number corresponding to the measure or, when the measure is highlighted, press ENTER to select
it. Then press ENTER to confirm your selection and leave the MODE menu.
It's a good idea to check the angle measure setting before executing a calculation that depends on a particular
measure. You may change a mode setting at any time and not interfere with pending calculations. From the Home
screen, try the following keystrokes to see this in action.
Expression
sin 45°
sin π°
sin π
sin 45
sin
The first line of keystrokes sets the TI-92 in degree mode and calculates the sine of 45 degrees. While the calculator
is still in degree mode, the second line of keystrokes calculates the sine of π degrees, approximately 3.1415°. The
third line changes to radian mode just before calculating the sine of π radians. The fourth line calculates the sine of
45 radians (the calculator remains in radian mode).
The TI-92 makes it possible to mix degrees and radians in a calculation. Execute these keystrokes to calculate tan
as shown in Figure 5.65: TAN 45 2nd MATH 2[Angle] 1) + SIN ( 2nd π ÷ 6 ) 2nd MATH 2[Angle] 2
π
45°+ sin
6
) ENTER. Do you get 1.5 whether your calculator is set either in degree mode or in radian mode?
The degree sign can also be entered by pressing 2nd D, which saves keystrokes. There is no corresponding key for
the radian symbol.
2 2
Graphing Technology Guide: TI-92
Figure 5.64: Graph of
5.4 Trigonometry
three times and move down to the fourth line of the first page of the mode menu where
to display the options. Use
Keystrokes
MODE
ENTER SIN 45 )
ENTER
SIN 2nd π )
ENTER
MODE
ENTER SIN 2nd π
) ENTER
SIN 45 ) ENTER
SIN 2nd π ÷ 6 )
π
ENTER
6
Copyright © Houghton Mifflin Company. All rights reserved.
3 x
− ≥ −
1 x 4
2
or to move from one option to the other.
Display
.7071067812
ENTER
.0548036651
ENTER
.8509035245
0
.5