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[" If the equation "(m^(2)+n^(2))x^(2)-2...

[" If the equation "(m^(2)+n^(2))x^(2)-2(mp+nq)x+p^(2)+q^(2)=0],[" has equal roots,then "],[[" (1) "mp=nq," (2) "mq=np],[" (3) "mn=pq," (4) "mq=sqrt(np)]]

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