Figure 15.4

That is, adding (or subtracting) any integer multiple of 277 to any angle 8 will affect neither the value of sine 0 nor that of cos 6.

The graphs of the sine and cosine functions indicate a constant range of fluctuation in each period, namely, + 1. This is sometimes alternatively described by saying that the amplitude of fluctuation is 1. By virtue of the identical period and the identical amplitude, we see that the cos 0 curve, if shifted rightward by 77/2, will be exactly coincident with the sin 6 curve. These two curves are therefore said to differ only in phase, i.e., to differ only in the location of the peak in each period. Symbolically, this fact may be stated by the equation cos 6 = sin 6

0 0

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