已知函数y=sinωx在(-π/2,π/2)内是减函数,则

问题描述:

已知函数y=sinωx在(-π/2,π/2)内是减函数,则
A.0<ω≤1
B.-1≤ω<0
C.ω≥1
D.ω≤-1

(-π/2,π/2)应小于等于半个周期,.-1≤ω≤1,
又函数是减函数,sin(-ωπ/2)>sin(ωπ/2),sin(ωπ/2).-1≤ω<0
选B