满分5 >
初中数学试题 >
如图,设点A(m,n)是锐角α的一条边上任意一点,则的值( ) A.只与角α的大...
如图,设点A(m,n)是锐角α的一条边上任意一点,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249016_ST/0.png)
的值( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249016_ST/images1.png)
A.只与角α的大小有关
B.只与点A在角α的边上的位置有关
C.与角α的大小及点A在角α的边上的位置有关
D.与角α的大小及点A在角α的边上的位置无关
考点分析:
相关试题推荐
如图,P是OA上一点,且P的坐标为(4,3),则sina和cosa的值分别是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/2.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/4.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/5.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249015_ST/6.png)
,
查看答案
在△ABC中,∠C=90°,a,b,c分别是∠A,∠B,∠C的对边.则有( )
A.b=atanA
B.b=csinA
C.a=csinA
D.c=asinA
查看答案
如图,已知直角三角形ABC的三边分别为a、b、c,则sinA等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249013_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249013_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249013_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249013_ST/2.png)
D.
查看答案
在Rt△ABC中,∠C=90°,则下列叙述正确的是( )
A.∠A的对边与斜边的比是∠A的正弦
B.∠A的对边与斜边的比是∠A的余切
C.∠A的邻边与斜边的比是∠A的正切
D.∠A的对边与邻边的比是∠A的正弦
查看答案
过点(5,12)的直线y=kx与x轴的正方向的夹角为α,则sinα等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249011_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249011_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249011_ST/2.png)
D.
查看答案