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[" If "ax^(2)+2hxy+by^(2)+2gx+2fy+c=0" r...

[" If "ax^(2)+2hxy+by^(2)+2gx+2fy+c=0" represents parallel "],[" straight lines,then "],[[" (a) "hf=bg," (b) "h^(2)=bc],[" (c) "a^(2)f=b^(2)g," (d) None of these "]]

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