①在直角坐标系中,
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表示什么曲线?(其中a,b,r是常数,且r为正数,θ为变量.)
②若点P为圆C:(x-2)
2+(y-3)
2=4上任意一点,且O为原点,A(1,0),求
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的取值范围.
考点分析:
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176017_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176017_ST/1.png)
,且f(x)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176017_ST/2.png)
.
①将函数f(x)的表达式化为Asin(ωx+φ)+h的形式;
②若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176017_ST/3.png)
,求函数f(x)的单调递增区间.
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已知两单位向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176016_ST/0.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176016_ST/1.png)
的夹角为120°,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176016_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176016_ST/3.png)
,试求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176016_ST/4.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176016_ST/5.png)
的夹角θ.
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已知cosα+sinα=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176015_ST/0.png)
,α∈(0,π).求cos2α的值.
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下面有5个命题:
①分针每小时旋转2π弧度;
②若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176014_ST/0.png)
,且x+y=1,则A,B,C三点共线;
③在同一坐标系中,函数y=sinx的图象和函数y=x的图象有三个公共点;
④函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224251022317640/SYS201311012242510223176014_ST/1.png)
是奇函数;
⑤在△ABC中,若sinA=sinB,则A=B.
其中,真命题的编号是
(写出所有真命题的编号)
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某时钟的秒针端点A到中心点O的距离为5cm,秒针均匀地绕点O旋转,当时间t=0时,点A与钟面上标12的点B重合,将A,B两点的距离d(cm)表示成t(s)的函数,则d=
,其中t∈[0,60].
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