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Two circles with centres \(O\) and \(O'\) of radii \(3 \ cm\) and \(4 \ cm\), respectivley intersect at two points \(P\) and \(Q\) such that \(OP\) and \(O'P\) are tangents to the two circles. Find the length of the common chord \(PQ\).
\(PQ = \) \(cm\)
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