given := triangle ABC
A→(h,k)
a1x +b1y + c1 =0 is the equn of the angle bisector of B(it MAY B INT. AS WEL AS EXTERIOR )
a2x +b2y + c2 =0 is the equn of the angle bisector of C(it MAY B INT. AS WEL AS EXTERIOR )
Find the equn of BC
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