已知角α的终边经过点P(x,-6),且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231049410154921/SYS201311012310494101549001_ST/0.png)
,则x的值为
.
考点分析:
相关试题推荐
集合A={0,2,a},B={1,a
2},若A∪B={0,1,2,4,16},则a的值为
.
查看答案
设函数f(x)=sin(2π+ϕ)(-π<ϕ<0),y=f(x)图象的一条对称轴是直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231049409930033/SYS201311012310494099300019_ST/0.png)
.
(Ⅰ)求ϕ;
(Ⅱ)求函数y=f(x)的单调增区间;
(Ⅲ)证明直线5x-2y+c=0与函数y=f(x)的图象不相切.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231049409930033/SYS201311012310494099300018_ST/images0.png)
如图所示,四棱锥P-ABCD的底面ABCD是边长为1的菱形,∠BCD=60°,E是CD的中点,PA⊥底面ABCD,PA=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231049409930033/SYS201311012310494099300018_ST/0.png)
.
(I)证明:平面PBE⊥平面PAB;
(Ⅱ)求二面角A-BE-P的大小.
查看答案
用综合法或分析法证明:
(1)如果a>0,b>0,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231049409930033/SYS201311012310494099300017_ST/0.png)
(2)求证
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231049409930033/SYS201311012310494099300017_ST/1.png)
.
查看答案
已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231049409930033/SYS201311012310494099300016_ST/0.png)
上两个相邻顶点为A、C,且B为椭圆上的动点,求三角形△ABC面积的最大值与最小值.
查看答案