满分5 >
初中数学试题 >
(1999•北京)在△ABC中,∠C=90°,如果sinA=,那么cotB的值等...
(1999•北京)在△ABC中,∠C=90°,如果sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128011_ST/0.png)
,那么cotB的值等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128011_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128011_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128011_ST/4.png)
考点分析:
相关试题推荐
(1999•广州)在△ABC中,∠C=90°,sinA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128010_ST/0.png)
,则tanB=( )
A.1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128010_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128010_ST/2.png)
D.
查看答案
(1999•烟台)Rt△ABC中,∠C=90°,若cosA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128009_ST/0.png)
,则tanB的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128009_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128009_ST/3.png)
D.
查看答案
(2007•天水)在△ABC中,∠C=90°,若sinB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128008_ST/0.png)
,则cosA的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128008_ST/2.png)
C.1
D.
查看答案
(1999•天津)已知sinα+cosα=m,sinα•cosα=n,则m、n的关系是( )
A.m=n
B.m=2n+1
C.m
2=2n+1
D.m
2=1-2n
查看答案
(1999•内江)当∠A为锐角,且cosA的值大于
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232807247312829/SYS201310212328072473128006_ST/0.png)
时,则∠A( )
A.大于30°
B.小于30°
C.大于60°
D.小于60°
查看答案