1. prove the following statements: (a) for any integer n, n if n is even n-1 if n is odd 2 (b) for all real numbers a, if x - |x] 1/2, then |2r 2 lx] 1

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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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