Texas Instruments TI-92 Getting Started page 32

command generates a list, which the sum( command then sums. Note that any letter can be used for the variable in
the sum, i.e., the K could just have easily been an A or an N.
Now calculate the sum starting at n = 0 by using
approximately 5.712848.
5.8.1 Graphing Parametric Equations: The TI-92 plots parametric equations as easily as it plots functions. Up to
ninety nine pairs of parametric equations can be plotted. In the first page of the MODE menu (Figure 5.1) change
the Graph setting to PARAMETRIC. Be sure, if the independent parameter is an angle measure, that the angle
measure in the MODE menu has been set to whichever you need, RADIAN or DEGREE.
You can now enter the parametric functions. For example, here are the keystrokes needed to graph the parametric
3
equations x = cos t and y = sin
ENTER ( SIN T) ) ∧ 3 ENTER (Figure 5.88).
Press WINDOW to set the graphing window and to initialize the values of t. In the standard window, the values
of t go from 0 to 2π in steps of
better viewing rectangle press ENTER three times and set the rectangle to go from –2 to 2 horizontally and
vertically (Figure 5.89). Now press
Figure 5.88: x = cos
3 2
Graphing Technology Guide: TI-92
Figure 5.87:
,
5.8 Parametric and Polar Graphs
3
t . First check that angle measure is in radians. Then press
π
≈ 0.1309, with the view from –10 to 10 in both directions. In order to provide a
24
GRAPH to draw the graph (Figure 5.90).
3 3
t and y = sin t
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12
∑
n
4(0.3)
n= 1
, and to edit the range. You should obtain a sum of
Figure 5.89: Parametric WINDOW menu
Y= ( COS T) ) ∧ 3