In triangle ABCABCABC, a=7a = 7a=7, b=8b = 8b=8, c=9c = 9c=9. Find sin(A2)\sin(\frac{A}{2})sin(2A).
106\frac{\sqrt{10}}{6}610
156\frac{\sqrt{15}}{6}615
13\frac{1}{3}31
56\frac{\sqrt{5}}{6}65