2013·福建·一模
1 . 已知
为坐标原点,对于函数
,称向量
为函数
的伴随向量,同时称函数
为向量
的伴随函数.
(Ⅰ)设函数
,试求
的伴随向量
的模;
(Ⅱ)记
的伴随函数为
,求使得关于
的方程
在
内恒有两个不相等实数解的实数的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c6f29b2b1955715616003d51d8b77f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7a9d4d6bf771fdd7c2cb26d3857316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716c8814c6e33b4f44d18a9139d6c8f1.png)
(Ⅰ)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad0aaae84649c4ed20c9fe98cfef4c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716c8814c6e33b4f44d18a9139d6c8f1.png)
(Ⅱ)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40d098fdf3d36c2b7e23a3539cd2f434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dc17d3cfcbe2ca45c60dd3e3e9594a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f8a69569c596846cfe8b2e9ec14be2.png)
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2012·福建福州·模拟预测
2 . 设向量![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f6486933fe3c2459cb13943244a088.png)
,
=(1,sinx-cosx),其中x∈R,函数
.
(1)求f(x)的最小正周期;
(2)若f(θ)
,其中0<θ
,求cos(θ+
)的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f6486933fe3c2459cb13943244a088.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119d134f03ebc1ca0a41e1506d4eec71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d9e69d5f0c8566edfb0ac3937b8c4a.png)
(1)求f(x)的最小正周期;
(2)若f(θ)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ada26e9b7fe22be819d675f72e086ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9b6d6b3ebda8727d7893714eda277ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
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2012·福建宁德·二模
3 . 已知函数
,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b41abf2781095344c33ecb4af0827f.png)
(1)求实数a, b的值;
(2)求函数
的最大值及取得最大值时
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12dd06e1f285c558e949b6512d88cbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b178d7a6c9e31c319407708df1cbce42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b41abf2781095344c33ecb4af0827f.png)
(1)求实数a, b的值;
(2)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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2013·福建福州·一模
4 . 已知平面向量a
,b=
,定义函数![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/f84a3236cf254a3785eda3dd37473b4e.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/cfdec37acec54fd4a15e080afa6b8505.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/b05bc3ee5ff34011ae1e51d6efa3a961.png)
(Ⅰ)求函数
的值域;
(Ⅱ)若函数
图象上的两点
、
的横坐标分别为
和
,
为坐标原点,求△
的面积.
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/99bee36d86df454b9ad6745f24fcc5ae.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/6fe49dcddc964871966197cd8f78a5a2.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/f84a3236cf254a3785eda3dd37473b4e.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/cfdec37acec54fd4a15e080afa6b8505.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/b05bc3ee5ff34011ae1e51d6efa3a961.png)
(Ⅰ)求函数
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/cc2e2976f86d49188db07bd4dff0ac60.png)
(Ⅱ)若函数
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/cc2e2976f86d49188db07bd4dff0ac60.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/00124e620c4e4a8a9bebbdaf3731ae76.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/9ee389a4a95d47ababa9b3b69374ad85.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/1e44c7d7aa3c436c99a824a1799625f3.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/306d195dc4f34c5a9d38ac8a79b82cf6.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/f2702ab4aea74ee1b418351a058c6eeb.png)
![](https://img.xkw.com/dksih/QBM/2013/9/4/1571340182110208/1571340187844608/STEM/8c45372f99294d06992c343e19764d71.png)
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