1 . 在
中,
,则![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511364608/STEM/7954e33f0f5b4f5d9af0ae89a8324df2.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511364608/STEM/e679f794f25e45578c235225f84b24f2.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511364608/STEM/2021dc1bff1a424ea9aeebdf8040f329.png)
![](https://img.xkw.com/dksih/QBM/2016/5/10/1572629506252800/1572629511364608/STEM/7954e33f0f5b4f5d9af0ae89a8324df2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 将函数f(x)=sinωx(其中ω>0)的图象向左平移
个单位长度,所得图象关于x=
对称,则ω的最小值是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6675a3e76fc37b4cf69b3661b734daf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65ecc1c16f2874ef4b7e0d6aed9db0b5.png)
A.6 | B.![]() | C.![]() | D.![]() |
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3 . 在△ABC中,A、B、C的对边分别为a、b、c,a∶b∶c=3∶3∶5,则
等于
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572707072565248/1572707078414336/STEM/d3fb86936fd8407da759591d9250d47b.png)
A.-![]() | B.-![]() | C.![]() | D.不是常数 |
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4 . 把函数f(x)=sin2x-2sinxcosx+3cos2x的图像沿
轴向左平移m(m>0)个单位,所得函数g(x)的图像关于直线x= 对称,则m的最小值为
![](https://img.xkw.com/dksih/QBM/2016/10/10/1573060768489472/1573060774256640/STEM/9bf59d92962847f3b8ce3344fcd34c00.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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