Sharp EL-9600, Руководство пользователя

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Blackline Masters/TRIGONOMETRY USING THE SHARP EL-9600 63
Cop
yr
ight ©
1998, Shar
p Electronics Cor
por
ation.
P
e
rmission is g
ranted to photocop
y f
or educational use only
.
Activity 1 Verify the half-angle formula
sin ( ) = ± ( ):
1. Press Y= CL to clear Y1 of an old expression. Press ENTER CL to clear
additional expressions.
2. Make sure the calculator is in radian mode by pressing 2ndF SET UP ,
touching B DRG , and double touching 2 Rad . Press 2ndF QUIT to exit the
set-up menu.
3. Enter the sin ( ) for Y1 by pressing sin X/
θ
/T/ n a/b 2 ENTER .
4. Enter the ( ) for Y2 (limiting domain to an interval where sine
is positive) by pressing 2ndF a/b 1 – cos X/
θ
/T/ n
▼
2
ENTER .
5. Sin ( ) is positive for 0 < x < 2
π
. Enter this range by pressing WINDOW
0 ENTER 2 2ndF
π
ENTER 2ndF
π
÷ 2 ENTER (–) 2
ENTER 2 ENTER 1 ENTER .
6. Check to see if they result in the same graph by pressing GRAPH .
Sketch what you see in the box below:
GRAPHICAL VERIFICATION OF FORMULAS AND IDENTITIES
3.3
NAME _____________________________________________________ CLASS __________ DATE __________
θ
2
(1 – cos
θ
)
2
(1 – cos x )
2
x
2
x
2
√
√
√