Because the values of circular functions repeat every 21 they are used to describe things...
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Because the values of circular functions repeat every 21 they are used to describe things that repeat periodically For example the maximum afternoon temperature in a given city might be modeled by the formula below In the formula t represents the maximum afternoon temperature in month x with x 0 representing January x 1 representing February and so on XT t 40 20 cos 6 The maximum afternoon temperature in March is 30 Round to the nearest integer as needed In May the maximum afternoon temperature is Round to the nearest integer as needed
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