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教师：齐次化+平方关系速求三角函数的正切值，高考数学试题解法6
教师：齐次化+平方关系速求三角函数的正切值，高考数学试题解法6
新课程高考数学考题讲解及难重点分析，高三必备，免费视频合辑210/381
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