Trigonometry Workbook For Dummies
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You can use the graph of a trigonometry function to show temperature change over time. For example, the temperature of a person’s body fluctuates during the day instead of staying at a normal 98.6 degrees. And actually, not everyone has a “normal” temperature. Lots of people run either hot or cold.

The body temperature of a certain person over a 24-hour period.
The body temperature of a certain person over a 24-hour period.

If you’re one of the special people with a normal temperature, then your temperature goes up and down by about 1 degree each day. The formula T(x) = sin(x + 0.262) + 98.6 may be a model of your temperature during a 24-hour period. The variable x is the number of hours since midnight, so this function uses a 24-hour clock. The temperatures are given in degrees Fahrenheit. The graph is in radians, so you can enter the numbers for the hours. The preceding figure shows what a graph of the temperatures may look like, noting a few times and temperatures.

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Mary Jane Sterling taught algebra, business calculus, geometry, and finite mathematics at Bradley University in Peoria, Illinois, for more than 30 years. She is the author of several For Dummies books, including Algebra Workbook For Dummies, Algebra II For Dummies, and Algebra II Workbook For Dummies.

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