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Touch the top of the right side of the screen and the list of three functions will
be displayed. The function Y = sin X is highlighted on the right side of the
screen, and the graph is darkened on the left side of the screen. Press
to
move from one graph to the next. Observe and note the changes in sin X when
you change the amplitude.
Method of Teaching
Use Blackline Master 4.1 to create an overhead or handout for demonstrating
changes in amplitude. Next use Blackline Masters 4.2 and 4.3 to create work-
sheets to demonstrate changes in period and phase shift. For analysis of period,
demonstrate the process of entering a "standard" trigonometric function for Y1
and a changed function for Y2. Use the trace feature to verify the new period.
For analysis of phase shift, demonstrate the use of SHIFT feature. Use the topics
For Discussion to supplement the worksheets.
Using Blackline Masters 4.2 and 4.3
The following problems appear on Blackline Masters 4.2 and 4.3. To investigate
the change in a trigonometric function by multiplying the argument
by 2, press
Y=
CL to access and clear Y1 of an old expression. Make sure the calculator
is in radian mode by pressing 2ndF
SET UP , touch B DRG, and double touch
2 Rad. Press 2ndF
QUIT to exit the menu.
Now, enter sin x for Y1 by pressing sin
X/ /T/n
ENTER and the sin (2x) for
Y2 by pressing CL
sin
(
2
X/ /T/n
)
ENTER . Set your viewing
window by pressing ZOOM , touching E TRIG, and double touching 1 sin x.
Note the change in the second graph versus the first graph. Engage the trace to
show the period has changed from 2
to .
16
Amplitude, Period, and Phase Shift/TRIGONOMETRY USING THE SHARP EL-9600
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