Solution: If n is an integer, n # 180 represents an integer
Chapter 1, Problem 98(choose chapter or problem)
If n is an integer, n # 180 represents an integer multiple of 180, 12n + 12 # 90 represents an odd integer multiple of 90, and so on. Decide whether each expression is equal to 0, 1, or -1 or is undefined. cot3n # 1804
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