k=tana
a屬于[兀/6,兀/4),tana在(0,π/2)上遞增
于是tana∈【tanπ/6,tanπ/4)即
tana∈【根號(hào)3/3,1)
[2兀/3,兀)上tana遞減
于是
tana∈【tanπ,tan2π/3)就是tana∈【0,-根號(hào)3)
于是k取值范圍就是
【根號(hào)3/3,1)并集【0,-根號(hào)3)
若直線l的斜率為k,傾斜角為阿爾法,而阿爾法屬于[兀/6,兀/4)并集[2兀/3,兀)則K的取值范圍是
若直線l的斜率為k,傾斜角為阿爾法,而阿爾法屬于[兀/6,兀/4)并集[2兀/3,兀)則K的取值范圍是
數(shù)學(xué)人氣:341 ℃時(shí)間:2020-05-11 19:40:17
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