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[" Consider a circle "S" with centre at ...

[" Consider a circle "S" with centre at the origin and radius "4" .Four circles "A,B,C" and "D" each with radius "],[" unity and centres "(-3,0),(-1,0),(1,0)" and "(3,0)" respectively are drawn.A chord "PQ" of the circles "],[" touches the circle "B" and passes through the centre of the circle "C" .If the length of this cherd cent be "],[" expressed as "]

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