The 14 teachers can be assigned to 9 identical sections of an introductory psychology course in ways if no teacher is assigned to more than one section (Type whole number)

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.

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