For an angle in standard position on the unit circle, if the measure of the angle is T radians (also an arc length of T), then the x-coordinate of the point where the terminal side intersects the circle represents the cosine of T, and the y-coordinate represents the sine of T. Thus, the unit circle can be graphed as the plane curve of the parametric equations 
for  .
Use the function editor to enter the parametric equations. We access the function
editor by pressing the |
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key. Enter the right side of each equation to the right of the equal sign. The SIN and
COS keys are near the middle of the calculator. Press the 
key to type a T.
