设AB=c,由三角形面积公式:√3=√3c/4,∴c=4.由余弦定理:a^2=16+1-2×4/2=13,∴a=√13.由正弦定理:c/sinC=a/sinA=b/sinB,由等比定理:c/sinC=(a-b)/(sinA-sinB),∴(a-b)/(sinA-sinB)=a/sinA=2√13/√3=2√39/3.
(2根号39)/3