if one of the bisectors of the angels between the pair of straight lines ax2+2hxy+by2=0 coincides with one of the straight lines ax2+2hxy+by2=0 then show that,h2(A+B)2={2hH-B(a-b)}{2hH+A(a-b)}
if one of the bisectors of the angels between the pair of straight lines ax2+2hxy+by2=0 coincides with one of the straight lines ax2+2hxy+by2=0 then show that,h2(A+B)2={2hH-B(a-b)}{2hH+A(a-b)}











