Texas Instruments TI-84 PLUS SILV Guidebook - Page 144
Split Screen, Getting Started: Exploring the Unit Circle
View all Texas Instruments TI-84 PLUS SILV manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 144 highlights
Chapter 9: Split Screen Getting Started: Exploring the Unit Circle Getting Started is a fast-paced introduction. Read the chapter for details. Use G-T (graph-table) split-screen mode to explore the unit circle and its relationship to the numeric values for the commonly used trigonometric angles of 0¡ 30¡, 45¡, 60¡, 90¡, and so on. 1. Press z to display the mode screen. Press to select Degree mode. Press † ~ Í to select Par (parametric) graphing mode. Press to select G-T (graphtable) split-screen mode. 2. Press to display the format screen. Press to select ExprOff. 3. Press o to display the Y= editor for Par graphing mode. Press to store cos(T) to X1T. Press to store sin(T) to Y1T. 4. Press p to display the window editor. Enter these values for the window variables. Tmin=0 Xmin=L2.3 Tmax=360 Xmax=2.3 Tstep=15 Xscl=1 Ymin=L2.5 Ymax=2.5 Yscl=1 5. Press r. On the left, the unit circle is graphed parametrically in Degree mode and the trace cursor is activated. When T=0 (from the graph trace coordinates), you can see from the table on the right that the value of X1T (cos(T)) is 1 and Y1T (sin(T)) is 0. Press ~ to move the cursor to the next 15¡ angle increment. As you trace around the circle in steps of 15¡, an approximation of the standard value for each angle is highlighted in the table. 6. Press y - and change Indpnt to Ask. Chapter 9: Split Screen 137