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依据向量的数量积公式求夹角，记忆常见的cos值，事半功倍呦
本部分的内容是为打卡易错题1000题的视频版；本节讲述了依据向量的数量积公式求夹角，希望对大家有帮助。@头条教育
高三数学一轮复习错题没人讲解，可看这里，解决你没搞明白的问题401/893
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