the centre of the circles cutting three circles x square +y square-2x-4y +4 =0, x square +ysquare - 4x-6y +4 =0,xsquare +ysquare-4x-8y +4 =0 orthogonallay if
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If the Circle
2
+
y
2
+
2
x
−
2
y
+
4
=
0
cuts the circlex
2
+
y
2
+
4
x
−
2
f
y
+
2
=
0
x2+y2+4x-2fy+2=0
orthogonally , then f =o
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