The diameters of a circle are along 2x+y-7 and x+3y-11=0 Then the equation of this circle,which also passes through (5,7) is
x2+y2-4x-6y-16=0
x2+y2-4x-6y-20=0
x2+y2-4x-6y-12=0
x2+y2+4x+6y-12=0
C = (2, 3) r = 5 Equation of circle is (x−2)2+(y–3)2=52
The angle between a pair of tangents drawn from a point P to the circle x2+y2+4x−6y+9sin2α+13cos2α=0 is 2α. The equation of the locus of the point P is