OpenStax, Algebra and Trigonometry 2e §7.4 The Other Trigonometric Functions · Exercise 72 · Trigonometry · Unit circle

The Other Trigonometric Functions · Exercise 72

The amount of sunlight in a certain city can be modeled by the function $h = 15 cos (\frac{1}{600} d),$ where $h$ represents the hours of sunlight, and $d$ is the day of the year. Use the equation to find how many hours of sunlight there are on February 11, the 42^nd day of the year. State the period of the function.

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OpenStax, Algebra and Trigonometry 2e · §7.4 The Other Trigonometric Functions · Exercise 72

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