Sharp EL-9900 - Manual (Page 120)

5
Advanced Keyboard/TRIGONOMETRY USING THE SHARP EL-9900
Copyright © 2002, Sharp Electronics Corporation. Permission is granted to photocopy for educational use only.
Investigate changes in amplitude.
1. Turn the calculator on and press Y= and CL to clear old expressions.
2. Enter y = sin x for Y1 by pressing sin X/
θ/T/n .
3. Enter y = 3 sin x for Y2 by pressing 3 sin X/
θ/T/n .
4. Press ZOOM A (ZOOM) 5 (Default) to view the graphs.
5. Notice that the 3 in front of the sine function makes the curve oscillate
between 3 and -3 instead of 1 and -1.
6. Press Y=
▼ CL to clear Y2. Enter y= -2 sin x for Y2 by pressing
( - ) 2 sin X/
θ/T/n .
7. Press GRAPH to view the graphs. Notice that the -2 in front of the sine
function makes the curve reflect on the x-axis and makes the curve oscillate
between -2 and 2.
AMPLITUDE