1.求满足cosx≥1/2(x∈[-π,π])的x的取值范围

题目

1.求满足cosx≥1/2(x∈[-π,π])的x的取值范围
2.求满足sinx≤根号3/2(x∈[0,2π)]的x的取值范围

答案

1.[-π/3,π/3]
2.{x|2kπ+2π/3