就是求f(x)在区间[-Π/2,0]得值域且关于(0,1)对称因为-Π/2≤x≤0则-Π≤2x≤0则-5Π/6≤2x+Π/6≤Π/6则-1≤sin(2x+Π/6)≤1/2则-2≤2sin(2x+Π/6)≤1则-2≤f(x)≤1关于(0,1)对称故g(x)得值域是[1，4]选A
