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To approximate sin
graphically, you will press Y= followed by CL to clear
3
an old expression for Y1. Enter the function sin x by pressing sin
X/ /T/n .
View the graph by pressing ZOOM , touching E TRIG, double touching 1 sin x.
Now, engage the trace by pressing TRACE and tracing near x =
= 1.047.
3
With the cursor located near x = 1.047, you can zoom in to find a better
approximation for the y value. Press ZOOM , touch A ZOOM, and double
touch 3 In to zoom in on the cursor. Once again, trace over near x = 1.047.
Zoom in one more time to see an even better approximation.
Evaluating Trigonometric Functions/TRIGONOMETRY USING THE SHARP EL-9600
7
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