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1 . 平行向量(共线向量):方向 _________________ 的非零向量
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2 . 两角和与差的正弦、余弦和正切公式:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994d6e7f47b3b98aa848c05d0af8f65e.png)
________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69aca84fbbde185d50148e3d4ebaf591.png)
________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b729f3bcad3527fd911eb71de25a64f9.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994d6e7f47b3b98aa848c05d0af8f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69aca84fbbde185d50148e3d4ebaf591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b729f3bcad3527fd911eb71de25a64f9.png)
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3 . 向量共线定理:向量
与
共线,当且仅当有唯一一个实数
,使________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd43a90a0434ed4b8b9f999e8a90f537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
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4 . 平面向量的数量积:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd01707e8d32f277b83c007a5b15bd7.png)
________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd01707e8d32f277b83c007a5b15bd7.png)
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