题型:单选题
难度:0.85
引用次数:133
题号:6060275
在Rt△ABC中,∠C=90°,BC=l,AC=2,那么cosB的值是( )
A.2 | B.![]() | C.![]() | D.![]() |
更新时间:2018-02-18 16:39:48
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【知识点】 余弦
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A.8 | B.9 | C.10 | D.11 |
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