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The graphs in this Unit are probably the most commonly used in all areas of science and engineering. They are used for modeling many different natural and mechanical phenomena (populations, waves, engines, acoustics, electronics, UV intensity, growth of plants and animals, etc).
The trigonometric graphs in this chapter are periodic, which means the shape repeats itself exactly after a certain amount of time. Anything that has a regular cycle (like the tides, temperatures, rotation of the earth, etc) can be modeled using a sine or cosine curve.
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