题干

若为△ABC的内角,则下列函数中一定取正值的是(   )

A:

B:

C:

D: cotA

上一题 下一题 0.0难度 选择题 更新时间:2018-01-18 03:25:24

答案(点此获取答案解析)

A

同类题3

— Did he realize the serious situation immediately?
— No. It was quite a long time ________ he really realized it.