已知A,B,C为
的三个内角,向量
,
,且
,求
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa55c36920e2f2bf7cbe03a2ce6481d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8750a25b99f0774faf40ad39c07a4f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba6a5b690147ddc09367fa3a482a10da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
更新时间:2020-12-03 23:03:59
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(0.85)
【推荐1】利用两角和(差)的余弦公式证明下列诱导公式:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95d314e91c622febc8861ea32dd71fab.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b00847751bcdad770a74946a5a1bea.png)
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解答题-问答题
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(0.85)
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【推荐2】(1)计算:
;
(2)已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34b98fe20e8c243dccec73509a13843.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5a26b71cd73c4f1798720317a9561a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a045422f3e657225b36b48c28a3c92a.png)
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解答题-问答题
|
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(0.85)
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【推荐1】已知向量
,且
,求向量
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fab96e1536cc5ac070c7799dff68745a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ca5bd365915b6e0826d3cf9ff7ec80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef8337706c550bc095d7a2bd872221a1.png)
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解答题-问答题
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(0.85)
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【推荐2】已知直线
与抛物线
交于
、
两点(异于原点).
(1)若直线
过抛物线焦点,求线段
的长度;
(2)已知
为坐标原点,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad6580b23e0576b82e7233f49583ab4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ac62b1ade07205ae2693ec1ab135def.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaff41080fdea43eea7efedf9ebc1498.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3825ccc273ef9a672a606432d165b866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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