高中数学代数与函数一其他练习题143
题目内容

如果 http://picflow.koolearn.com/upload/papers/20140824/20140824050850050596.png的三个内角的余弦值分别等于 http://picflow.koolearn.com/upload/papers/20140824/20140824050850066627.png三个内角的正弦值,则

2021-07-21

A.http://picflow.koolearn.com/upload/papers/20140824/20140824050850050596.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050850066627.png都是锐角三角形

B.http://picflow.koolearn.com/upload/papers/20140824/20140824050850050596.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050850066627.png都是钝角三角形

C.http://picflow.koolearn.com/upload/papers/20140824/20140824050850050596.png是锐角三角形,http://picflow.koolearn.com/upload/papers/20140824/20140824050850066627.png是钝角三角形

D.http://picflow.koolearn.com/upload/papers/20140824/20140824050850050596.png是钝角三角形,http://picflow.koolearn.com/upload/papers/20140824/20140824050850066627.png是锐角三角形

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