If the solid curve in Figure 3.17 represents sin(2?t). what does the dotted curve represent? That is, the dotted curve can be written in the form Asin(2?t+phase) what are A, f, and phase? I know A is 2, f is 2, but why phase is ?. How do you know that.

.0 2.0??? -0.5 Figure 3.17 Figure for Problem 3.5