Using Blackline Master 6.2
To solve a trigonometric equation graphically using the CALC feature of the
Sharp graphing calculator, you will turn the calculator on and press Y= CL
to access and clear Y1 of an old expression. Solving can be done in degrees and
radians. Let's do this one in radians by pressing 2ndF SET UP , touching
B DRG, and double touching 2 Rad. Press 2ndF QUIT to exit the menu.
To find the solutions of 2 sin
2
x – cos x – 1 = 0, press 2 ( sin X/θ/T/n )
a
b
2 – cos X/θ/T/n – 1 ENTER .
Set your viewing window to the principal values for sine and cosine by pressing
WINDOW
(–)
2ndF π ÷ 2 ENTER 2ndF π ENTER 2ndF π ÷
4 ENTER
(–)
1 ENTER 1 ENTER 1 ENTER . Press GRAPH to view
the graph.
To "calculate" an intercept (solution), press 2ndF CALC and double touch
5 X_Incpt. You can calculate another intercept by pressing 2ndF CALC
and double touching 5 X_Incpt again.
Pressing 2ndF CALC and double touching 5 X_Incpt will find the third solution.
26 Solving Trigonometric Equations/TRIGONOMETRY USING THE SHARP EL-9600
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