倾斜角的正弦值 为4/5,则其余弦值是（＋／－）根号（1－16／25）＝土3／5
那么直线的斜率＝倾斜角的正切值＝（4／5）／（土3／5）＝土4／3
一直线的倾斜角的正弦值 为4/5,则该直线的斜率为?
一直线的倾斜角的正弦值 为4/5,则该直线的斜率为?
数学人气：336 ℃时间：2020-03-26 10:26:15
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