Sharp EL-9900 - Manual (Page 121)

6
Advanced Keyboard/TRIGONOMETRY USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
Investigate the change in a trigonometric function by multiplying
the argument
θ by 2.
1. Press Y= CL to access and clear Y1 of an old expression.
2. Make sure the calculator is in radian mode by pressing 2ndF SET UP ,
B (DRG) and 2 (Rad). Press 2ndF QUIT to exit the menu.
3. Now, enter sin x for Y1 by pressing sin X/
θ/T/n ENTER and the sin (2x)
for Y2 by pressing CL sin ( 2 X/
θ/T/n ) ENTER .
4. Set your viewing window by pressing ZOOM E (TRIG) and 1 (sin x).
Note the change in the second graph versus the first graph. Engage the
trace to show the period has changed from 2
π to π.
Investigate the change in a trigonometric function by subtracting
to the argument
θ.
1. Press Y=
▼ CL and enter Y= sin (X - 3π/2) for Y2 by pressing
sin ( X/
θ/T/n
– 3 2ndF
π
÷ 2 ) ENTER .
2. Press GRAPH to view the graphs. Observe and note the changes in sin x
when you change the phase shift.
PERIOD AND PHASE SHIFT
3
π
2