In Exercises 107–112, 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° (T = 20). What are cos 20° and sin 20°?
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