CHAPTER 13 Calculator Notes for the TI-83 Plus and TI-84 Plus
Note 13A • Unit Circle
Follow these steps to graph a unit circle:
a. Press MODE and set the third line to Degree and the fourth line to Par.
b. On the Y screen, enter the equations X1T⫽cos(T) and Y1T⫽sin(T).
c. Set the Window screen to
Tmin 0
Tmax 900
Tstep 15
Xmin ⫺2.35
Xmax 2.35
Xscl 1
Ymin ⫺1.55
Ymax 1.55
Yscl 1
d. Display the graph.
Now you can press
TRACE
to find the coordinates of points on the circle.
Note 13B • Radians
In Radian mode, the calculator treats the input of a sine, cosine, or tangent
function as a radian measure instead of a degree measure. It also returns a
radian measure when you use the inverse functions. To put the calculator in
Radian mode, press MODE and set the third line to Radian.
(continued)
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Note 13B • Radians (continued)
TI-83 Plus and TI-84 Plus
Overriding Radian or Degree Mode
In Radian mode, enter a degree symbol, °, after the input if you want the
calculator to override the Radian mode and treat the input as a degree
measure. To find the degree symbol, press 2nd [ANGLE] 1:°.
In Degree mode, enter a radian symbol, r, after the input if you want the
calculator to override the Degree mode and treat the input as a radian
measure. To find the radian symbol, press 2nd [ANGLE] 3:r.
Converting between Radians and Degrees
You can use the override feature to convert an angle measure from radians
to degrees or from degrees to radians.
For example, follow these steps to convert 30° to radians:
a. Set the calculator to Radian mode.
b. On the Home screen, enter 30 and press 2nd [ANGLE] 1:°.
c. Press ENTER . This gives you the radian measure expressed as a decimal.
d. To find the radian measure expressed as a multiple of , press ⫼ 2nd []
ENTER MATH 1: Frac ENTER . Imagine that follows the fraction. So, 30° is
equivalent to _16 , or __
6 , radians.
7
For another example, follow these steps to convert __
12 radians to degrees:
a. Set the calculator to Degree mode.
b. On the Home screen, press ( 7 2nd [] ⫼ 12 ) 2nd [ANGLE] 3:r.
7
c. Press ENTER . So, __
12 radians is equivalent to 105°.
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TI-83 Plus and TI-84 Plus
Note 13C • Secant, Cosecant, and Cotangent
The calculator does not have built-in secant, cosecant, or cotangent
functions. You must calculate these functions by using the appropriate
reciprocal identities.
For example, in Radian mode, to evaluate sec __
6 ,
press 1 ⫼ COS 2nd [] ⫼ 6 ) ENTER , or press
ENTER .
COS 2nd [] ⫼ 6 ) x
⫺1
To evaluate csc __
6 , press 1
press SIN 2nd [] ⫼ 6 ) x
⫺1
To evaluate cot 6, press 1
press TAN 2nd [] ⫼ 6 ) x
⫺1
⫼ SIN 2nd [] ⫼ 6 ) ENTER ,
or
ENTER .
⫼ TAN 2nd [] ⫼ 6 ) ENTER ,
or
ENTER .
To find the inverse of a secant, cosecant, or cotangent function, use the
reciprocal identity’s inverse with the reciprocal of the input.
For example, in radian mode, to find sec1(3),
press 2nd [COS⫺1] 1 ⫼ 3 ) ENTER .
To find csc1(3), press
2nd [SIN⫺1] 1 ⫼ 3 ) ENTER .
To find cot1(3), press
2nd [TAN⫺1] 1 ⫼ 3 ) ENTER .
Note 13D/App • Collecting Sound Frequency Data
Using the EasyData App
You need a CBL2 and the EasyData application to collect sound frequency
data. Plug the microphone probe into channel CH 1 of the CBL2, and
connect the calculator to the CBL2. Press APPS and select EasyData. If the
program does not recognize the microphone, follow these steps:
a. Press Setup ( WINDOW ) and select Other Sensors.
b. Select CH1 and press Next ( ZOOM ). Then choose Microphone and
press Next.
Ring the tuning fork and press Start ( ZOOM ) to begin collecting data.
The CBL2 collects data for only 0.02 second, so it will stop again almost
immediately. The calculator will display a graph. If the graph does not
look like a sinusoidal curve, press Main ( TRACE ) and then Start ( ZOOM ) to
(continued)
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Note 13D/App • Collecting Sound Frequency Data Using
the EasyData App (continued)
TI-83 Plus and TI-84 Plus
try again. Press OK ( GRAPH ) to overwrite the data. If you continue to have
trouble collecting good data, adjust the microphone’s position.
When you have good data, press Main ( TRACE ) and then Quit ( GRAPH ).
The calculator will tell you that time data are stored in list L1 and sound
frequency data are stored in list L2. Press OK ( GRAPH ).
Note 13E • Polar Coordinates
Graphing Polar Equations
Follow these steps to graph a polar equation:
a. Press MODE and set the third line to Degree and the fourth line to Pol.
b. On the Y screen, enter a function in the form r f (). Press X,T,␪,n to
get .
c. On the Window screen, set values of as well as x and y.
d. Display the graph.
[2.35, 2.35, 1, 0.5, 2.6, 1]
Tracing Polar Coordinates
No matter what mode you’re in, you can find the polar coordinates of a
point on a graph by pressing 2nd [FORMAT] and selecting PolarGC. Then when
you trace or move the cursor about the screen, you will see coordinates in
the form (r, ).
[4.7, 4.7, 1, 3.1, 3.1, 1]
Remember to change the format back to RectCG in order to display
coordinates in the form (x, y).
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Book Title
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Do you have any suggestions for improving the student or teacher material?
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