Solving Trigonometric Equations - Sharp EL-9600 User Manual

NAME _____________________________________________________ CLASS __________ DATE __________
6.1

SOLVING TRIGONOMETRIC EQUATIONS

To solve a trigonometric equation graphically using the
zoom feature:
1. Turn the calculator on and press Y=
expression. Set the calculator to degree mode by pressing 2ndF
touching B DRG, and double touching 1 Deg. Press 2ndF
the menu.
2. To find the solutions of 3sin
b
) a 2
3. Set your viewing window to the principal values for sine by pressing
WINDOW
ENTER 1
4. To save this original graph and viewing window, press ZOOM , touch
G STO, and double touch 1 StoWin.
5. Set the zoom factors by pressing ZOOM , touching B FACTOR, pressing
ENTER 5
6. To find the left intercept press TRACE and move the cursor near this
intercept by continuing to press the
7. Now, press ZOOM , touch A ZOOM, and double touch 3 In to zoom in on
the left intercept and solution of this equation. Press TRACE and
trace near and approximate the intercept.
8. Return to the original screen by pressing ZOOM , touching H RCL, and
double touching 1 RclWin. Trace to find the right intercept.
72 Blackline Masters/TRIGONOMETRY USING THE SHARP EL-9600
2
x – 4sin x + 1 = 0, press 3
– 4 sin X/ /T/n
(–)
9 0 ENTER
ENTER 1 ENTER . Press GRAPH to view the graph.
ENTER 5 ENTER . Press GRAPH to exit the menu.
CL to access and clear Y1 of an old
+ 1 ENTER .
9 0 ENTER 1
key.
SET UP ,
QUIT to exit
( sin X/ /T/n
(–)
0 ENTER 1
to