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[" If "(a^(2)+b^(2))x^(2)+2(ab+bd)x+c^(2...

[" If "(a^(2)+b^(2))x^(2)+2(ab+bd)x+c^(2)+d^(2)=0" has no real roots,then "],[[" (a) "ad=bc," (b) "ab=cd," (c) "ac=bd," (d) "ad!=bc]]

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