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To verify the identity sin
2
Y1 = sin
x + cos
graph. To do this press Y= to access the Y1 prompt. Press CL to clear Y1 of
an old expression, and enter the sin
b
X/ /T/n
)
a
1 for Y2 by pressing CL
Method of Teaching
Use Blackline Master 3.1 to create an overhead or handout for graphically
verifying trigonometric formulas and identities. Demonstrate the process
of entering the equality's left- and right-hand expressions and when
necessary, emphasize the intervals where functions are positive or negative
(as demonstrated in Using Blackline Master 3.2). Next, use the Blackline Masters
3.3 through 3.5 to create worksheets for the students. Have the students verify
the various formulas and identities. Use the topics For Discussion to supplement
the worksheets.
Graphical Verification of Formulas and Identities/TRIGONOMETRY USING THE SHARP EL-9600
2
2
+ cos
= 1, you will graph the "sin
2
x and the "1" as Y2 = 1, and show that they are the same
2
2
+
(
cos
1
ENTER . Press GRAPH to view the graph.
2
x + cos
x for Y1 by pressing (
b
X/ /T/n
)
a
2
2
2
+ cos
" as
sin
ENTER . Enter the
11
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