1.

If the circle x2+y2+4x+22y+c=0 bisects the circumference of the circle x2+y2−2x+8y−d=0 (c,d>0), then the maximum possible value of cd is

Answer»

If the circle x2+y2+4x+22y+c=0 bisects the circumference of the circle x2+y22x+8yd=0 (c,d>0), then the maximum possible value of cd is



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