Blackline Masters/TRIGONOMETRY USING THE SHARP EL-9600
61
Cop
yr
ight ©
1998, Shar
p Electronics Cor
por
ation.
P
e
rmission is g
ranted to photocop
y f
or educational use only
.
1.
Verify the double angle formula sin 2
θ
= 2 sin
θ
cos
θ
, by graphing Y1 = sin
(2
x
) and Y2 = 2 sin
x
cos
x
and show that they are in fact the same graph.
2.
Turn the calculator on and press Y= . Press CL to clear Y1 of an old
expression. Press
▼
CL to clear additional expressions.
3.
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.
4.
Now enter sin (2
x
) for Y1 by pressing sin ( 2 X/
θ
/T/
n
) ENTER
and the 2 sin
x
cos
x
for Y2 by pressing 2 sin X/
θ
/T/
n
cos X/
θ
/T/
n
ENTER .
5.
Set your viewing window by pressing WINDOW EZ , touch
5
, touch on
the screen, touch
6 -2
π
<X,<2
π
, touch on the screen, and touch
5 -5<Y<5
.
GRAPHICAL VERIFICATION OF FORMULAS AND IDENTITIES
3.1
NAME _____________________________________________________ CLASS __________ DATE __________
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