UNIT CIRCLE Circular Functions (Page 9 of 10)

Now change the window settings so that T can vary from 0 to 360. Set Tstep to 1 to allow us to trace the circle in increments of 1 degree.

 WINDOW key.

 Down arrow key. 360 ENTER key. 1 ENTER key.

 Calculator screen image.

Graph the circle, then use TRACE to move the cursor along the circle counter-clockwise. At each point, the x-coordinate represents the cosine of angle T (in degrees), and the y-coordinate represents the sine.

 GRAPH key.

 TRACE key. Right arrow key. ...

 Calculator screen image. Calculator screen image.
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