f(x)=（a+b）·b=a·b+b²
=sinxcosx-3/2+cos²x+1
=1/2sin2x+(cos2x+1)/2+1-3/2
=1/2(sin2x+cos2x)
=√2/2(sin2x·√2/2+√2/2·cos2x)
=√2/2 sin(2x+π/4)
-π/2≤x≤0
-π≤2x≤0
-3π/4≤2x+π/4≤π/4
当2x+π/4=-3π/4时,取得最小值为√2/2×(-√2/2)=-1/2
当2x+π/4=π/4时,取得最大值为√2/2×√2/2=1/2
所以值域为[-1/2,1/2]