已知α∈（0,π/2）,利用三角函数线,则满足tanα>=cotα的取值范围

Question

已知α∈（0,π/2）,利用三角函数线,则满足tanα>=cotα的取值范围

Answer 1

tanα ·cotα=1
tanα>=cotα
tanα>0
cotα>0
(tanα)^2>=1
tanα>1
π/2>α>π/4