Figure 2.1. Part (eh) shows two cycles of a sine wave. Part B shows two cycles of a square wave. The value starts at zero and goes straight up to the top. It runs along horizontally until it turns straight down to a point as far below zero as it was above zero. before. Then it goes horizontally along until turning straight up again to the level where it started. That completes one cycle. The next cycle is an exact duplicate of the first. Part C is a triangular wave. It starts at zero and goes up to the right to a peak. At the peak it turns downward going down to the right to a point as far below zero as it was above before. Then it turns up and to the right again with this cycle ending at zero. The next cycle is a repeat of the first. Part D is a sawtooth wave. It starts at zero going up to the right. At the peak it turns and goes straight down. At the bottom which is as far below zero as it was above it turns and goes up to the right again ending at zero. Subsequent cycles are duplicates of the first. There a total of 4 cycles of this wave. End verbal description.
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