and double touch 1 Auto to view the graph. Now, engage the trace by pressing
TRACE . Notice the tracer appears at x = 20° since it is the middle of the
x values.
For Discussion
Students can calculate sin 25° in radian mode by pressing sin 2 5 MATH ,
touching E ANGLE, double touching 1°, and pressing ENTER . Students can
store a graph with a particular viewing window for repeated use by using the
StoGD command in the DRAW menu. For more detail, refer to the EL-9600
Owner's Manual. Discuss the use of the negative sign like cos (
–
10°). This is the
first assignment that uses a negative angle. Also remind them of the difference
between the negative key (a short dash within parentheses) and the minus key
(no parentheses).
Additional Problems
Evaluate the following directly:
(1) cos 27°
(2) cot 52°
(3) sec
Evaluate the following graphically:
(4) sin 107°
(5) tan
(6) csc
Evaluating Trigonometric Functions/TRIGONOMETRY USING THE SHARP EL-9600 9
5π
3
5
π
4
π
7
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