If $P\left(x_1,y_1\right),Q\left(x_2,y_2\right),R\left(x_3,y_3\right)\text{and}S\left(x_4,y_4\right)$ are four concyclic points on the rectangular hyperbola ) and $xy=c^2$ , then coordinates of the orthocentre ofthe triangle $PQR$ is

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