sin90 = a/c = 1/1 = 1 cos90 = b/c = 0/1 = 0 tan90 = a/b = 1/0 = 정의되지 않음. sin0 = a/c = 0/1 = 0 cos0 = b/c = 1/1 = 1 tan0 = a/b = 0/1 = 0
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