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NAME _____________________________________________________ CLASS __________ DATE __________
3.3
GRAPHICAL VERIFICATION OF FORMULAS AND IDENTITIES
Activity 1
1. Press Y=
additional expressions.
2. Make sure the calculator is in radian mode by pressing 2ndF
touching B DRG, and double touching 2 Rad. Press 2ndF
set-up menu.
3. Enter the sin (
4. Enter the (
is positive) by pressing 2ndF
ENTER .
x
5. Sin (
) is positive for 0 < x < 2 . Enter this range by pressing WINDOW
2
0
ENTER
ENTER
2
6. Check to see if they result in the same graph by pressing GRAPH .
Sketch what you see in the box below:
Verify the half-angle formula
(1 – cos )
sin (
) = ± (
2
CL to clear Y1 of an old expression. Press ENTER
x
) for Y1 by pressing sin
2
(1 – cos x)
) for Y2 (limiting domain to an interval where sine
2
2
2ndF
ENTER
ENTER
1
ENTER .
Blackline Masters/TRIGONOMETRY USING THE SHARP EL-9600
):
2
X/ /T/n
a/b
a/b
1
–
cos X/ /T/n
2ndF
÷
2
CL to clear
SET UP ,
QUIT to exit the
2
ENTER .
2
ENTER
(–)
2
63
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