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高二理科题(九十五)直线x乘以cosa+y-1=0(a属于R)的

2010-08-22 16:23:02德***
直线x乘以cosa+y-1=0(a属于R)的倾斜角为A,则A的取值范围是?高二理科题(九十五)直线x乘以cosa+y-1=0(a属于R)的倾斜角为A,则A的取值范围是?:直线x乘以cosa+y-1=0(a属于R)的倾斜角为A,则A的取?

最佳回答

  • 直线x乘以cosa+y-1=0(a属于R)的倾斜角为A,则A的取值范围是? x*cosa+y-1=0(a属于R) y=-x*cosa+1 斜率k=-cosa,a∈R,→-1≤-cosa≤1,即 -1≤tanA≤1,0≤A<180° 倾斜角A的取值范围是0°≤A≤45°或135°≤A≤<180° 也可写为A∈[0,π/4]∪[3π/4,π)
    2010-08-22 16:56:55
  • 很赞哦! (79)