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如图,在Rt△ABC中,∠C=90°,BC=a,CA=b,AB=C,则下列结论正...
如图,在Rt△ABC中,∠C=90°,BC=a,CA=b,AB=C,则下列结论正确的是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249019_ST/images0.png)
A.sinB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249019_ST/0.png)
B.cosB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249019_ST/1.png)
C.tanB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249019_ST/2.png)
D.cotB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101458202324964/SYS201311031014582023249019_ST/3.png)
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在△ABC中,∠C=90°,a,b,c分别是∠A,∠B,∠C的对边,下列等式:①b=ccosB;②b=atanB;③a=csinA;④a=ccosB;⑤a=btanA;⑤a=bcotA,其中正确的有( )
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在Rt△ABC中,∠C=90°,则下列关系中错误的是( )
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如图,设点A(m,n)是锐角α的一条边上任意一点,则
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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
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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( )
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,
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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