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高中数学新教材第四章《三角函数》中有一道例题,课本已经给出三种证法.笔者又给出六种证法,供大家参考。
There is an example in the “Trigonometric Function” in the fourth chapter of the New High School Mathematics Textbook. The textbook has given three kinds of proofs. The author gives six kinds of proofs for your reference.