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Trigonometry 20 Online
OpenStudy (anonymous):

The height H in feet above the ground of the seat of a playground swing can be modeled by H(Θ) = -4cosΘ + 6, where Θ is the angle the swing makes with a vertical extended to the ground. Graph the height of the swing's seat for 0º ≤ Θ ≤ 90º. Then answer this question: How high is the swing when Θ = 60º?

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