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二倍角的正弦，余弦，正切

二倍角的正弦，余弦，正切. 2004.2.17. 欢迎各位老师莅临指导. 教学目标： 1 熟练掌握二倍角公式及其变形后的公式。 2 灵活应用二倍角公式进行化简，变形，证明， 提高学生分析问题，解决问题的能力。. 谢谢光临，多多指教.

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二倍角的正弦，余弦，正切

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  1. 二倍角的正弦，余弦，正切 2004.2.17 欢迎各位老师莅临指导 教学目标： 1 熟练掌握二倍角公式及其变形后的公式。 2 灵活应用二倍角公式进行化简，变形，证明， 提高学生分析问题，解决问题的能力。

  2. 谢谢光临，多多指教

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