In a tri ABC,a,b, A are given and c1,c2, are two values of the third side c.The sum of the areas of two triangles with sides a,b,c1 and a,b,c2 is
(a) (1\2)b^2 sin2A
(B) 1\2 a^2 sin2A
(C) b^2 sin2A
(d) NONE OF THESE
solve..........
rate assure with correct ans. ................