=1 where X=x−2Y=y+3,a=3 and b=2 As we know equation of director circle (because locus of two perpendicular pair of tangents shows its director circle) is x2+y2=a2+b2 ‌⇒‌‌(x−2)2+(y+3)2=(3)2+(2)2 ‌⇒‌‌x2+4−4x+y2+9+6y=13 ‌⇒‌‌x2+y2−4x+6y=0