Question

若直线λ的斜率k＞ －1 ,则直线λ的倾斜角α的取值范围是

Answer 1

-1<k<0
tan3π/4<tanα<tanπ
3π/4<α<π
k>=0
tan0<=tanα<tanπ 2 0<=α<π/2
所以
0<=α<π/2,3π/4<α<π </tanα<tanπ
</k<0