y=2sin(ωx+π/6)sin(ωx+π/6)=1/2，解得ωx+π/6=2kπ+π/6或ωx+π/6=2kπ+5π/6，k∈Zωx=2kπ或2kπ+2π/3，k∈Z.所以2π/(3ω)=π/3，解得ω=2所以T=2π
答案如图：@，@
你怎么知道选c
因为15784大于5478
是
