Blackline Masters/TRIGONOMETRY USING THE SHARP EL-9600 61
Copyright © 1998, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
1. Verify the double angle formula sin 2θ = 2 sin θ cos θ, by graphing Y1 = sin
(2x) 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 (2x) 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
-
2π<X,<2π, 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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