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上海教育出版社出版的课本《数学(高中一年级第二学期)》有这样一道经典的习题:(1)完成下表(θ为弧度):(2)观察上表中的数据,你能发现什么规律?课本提供的问题(2)的答案为:随着θ越来越
Shanghai Education Publishing House published textbook “math (high school second semester)” There is such a classic exercise: (1) the completion of the following table (θ is radian) :( 2) observe the data in the above table, you can find What is the law? The textbook provides the answer to (2) as follows: As θ is increasing