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[" Alustration "12" .If the pairs of lin...

[" Alustration "12" .If the pairs of lines "ax^(2)+2hxy+by^(2)=0" and "],[x^(2)+2h'xy+b'y^(2)=0" have one line in common,then "],[(y-a'b)^(2)=],[[(1-a'b)^(2)=," (b) "4(h'b-hb')(ha'-h'a)],[" (d) "2(h'b-hb')(ha'-h'a)," (d) "4(h'b+hb')(ha'+h'a)]]

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