In Exercises 107112, set your TI graphing calculator in
Chapter 1, Problem 107(choose chapter or problem)
In Exercises 107112, set your TI graphing calculator in parametric and degree modes. Set the window and functions (see the third screen) as shown here, and graph. A circle of radius 1 will appear on the screen. Trace to move a short distance around the circle. In the screen, the point on the circle corresponds to an angle T = 25. Since r = 1, cos 25 is X = 0.90630779, and sin 25 is Y = 0.42261826. Use the right- and left-arrow keys to move to the point corresponding to 20 1T = 202. What are cos 20 and sin 20?
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