函数y=根号2sin(x+π/4)+1的定义域为什么?
问题描述：
函数y=根号2sin(x+π/4)+1的定义域为什么?
A.[2kπ-5π/12,2kπ+11π/12]k∈z
B.[kπ-5π/12,kπ+11π/12]k∈z
C[2kπ-11π/12,2kπ+5π/12]k∈z
D[kπ-11π/12,kπ+5π/12]k∈z
答
2sin(x+π/4)+1>=0
sin(x+π/4)>=-1/2
-π/3+2kπ