Properties of functions can be observed from their graphs. We begin by graphing the sine and the cosine functions. We make a table of values, plot the points, and then connect those points with a smooth curve. It is helpful to first draw a unit circle and label a few points with coordinates. We can either use the coordinates as the function values or find approximate sine and cosine values directly with a calculator.
s
0
0
1
0.5
0.8660
0.7071
0.7071
0.8660
0.5
1
0
0.7071
0
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