Sharp EL-9600 User Manual page 12

Method of Teaching
Use Blackline Master 2.1 to create an overhead or handout for direct and
graphical evaluation of trigonometric functions. Demonstrate the procedure
changes for radian measurement. Remind the students of the location of
cosecant, secant, and cotangent within the MATH menu.
Next, use the Blackline Masters 2.2 through 2.4 to create worksheets for the
students. Have the students evaluate the six trigonometric functions directly
and graphically for the various degree and radian measurements. Use the
topics For Discussion to supplement the worksheets.
Using Blackline Master 2.2
The following problem appears on Blackline Master 2.2. Evaluate sec directly
4
+ –
in degree mode. Press CL to enter computation mode and clear the home
screen. Press 2ndF SET UP to verify the calculator is in degree mode. If it is
not, change it to degree mode. Press 2ndF QUIT to exit the menu. Enter and
evaluate the expression by pressing MATH , touching A CALC, double touching
09 sec, pressing 2ndF a/b 4 MATH , touching E ANGLE, double
touching 4 r, and pressing ENTER .
Evaluate tan 20° graphically. Press Y= and press CL to remove an old
expression for Y1. Press 2ndF SET UP to verify the calculator is in degree
mode. If it is not, change it. Press 2ndF QUIT to exit the menu. Enter the
function tan x for Y1 by pressing tan X/ /T/n . Instead of graphing the
function in the default viewing window for tangent, press WINDOW adjust the
Xmin and Xmax to 10° and 30° (value of interest ± 10° ) respectively to start out
closer to the value of interest. Set the Xscl = 1. Press ZOOM , touch A ZOOM,
8 Evaluating Trigonometric Functions/TRIGONOMETRY USING THE SHARP EL-9600