如图,在直角
中,
,
于点D,则
等于( )
![](https://img.xkw.com/dksih/QBM/2024/1/27/3420295152238592/3422358482042880/STEM/7f033d999ebf4664aeb4e94b07e6c9b1.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7a71b30063e929dfcb71ae1693149e.png)
![](https://img.xkw.com/dksih/QBM/2024/1/27/3420295152238592/3422358482042880/STEM/7f033d999ebf4664aeb4e94b07e6c9b1.png?resizew=174)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-02-25 18:55:17
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【推荐1】在△ABC中,∠A、∠B、∠C的对边分别为a、b、c,且a=5,b=12,c=13,下面四个式子中正确的有( )
A.sinA=![]() | B.cosA=![]() | C.tanA=![]() | D.sinB=![]() |
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【推荐2】△ABC中,a、b、c分别是∠A、∠B、∠C的对边,如果a2+b2=c2,那么下列结论不正确的是( )
A.bcosB=c | B.csinA=a | C.atanA=b | D.tanB=![]() |
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