解题方法
1 . 如图所示是两个半径不同的同心圆,半径分别为1和
是小圆
上的一个动点,
是大圆
上的三个不同的动点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7231c8dd7928b46f06a4286903c47363.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715469668352000/2799679180554240/STEM/60ad64d120bf444cb1732c9242531b77.png?resizew=165)
(1)求证![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bbe8a224c56e320004764101b9871f.png)
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2353c7e8ad00d9d25c71535bd45d7568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28855a0db693584aabac1df99dfade3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7231c8dd7928b46f06a4286903c47363.png)
![](https://img.xkw.com/dksih/QBM/2021/5/6/2715469668352000/2799679180554240/STEM/60ad64d120bf444cb1732c9242531b77.png?resizew=165)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bbe8a224c56e320004764101b9871f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219924df5ba319fe45e8356621730fe5.png)
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解题方法
2 . 已知向量
=(
,
),
,其中
是锐角.
(1)当
时,求
;
(2)证明:向量
与
垂直;
(3)若向量
与
夹角为
,求角
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d66c03d4ca06819a6ce7fc8ea6de0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4179e1ab8705cf19ea7aaf48888843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375c09fb4e33b04674495db4ab5bb596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cde33974f1c49a3df4589c00974c99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b0fe4d834e8eaca89ceaf9c64cdabd9.png)
(2)证明:向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b91254db5ff748150f449c5cdd256c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f1c1dd6b13d92f2cc2eef097e14c07c.png)
(3)若向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/433b94c39737727e53468df419d8314a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
您最近一年使用:0次