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The lines represented by x^(2)+2lambda x...

The lines represented by `x^(2)+2lambda xy+2y^(2)=0` and the lines represented by `1+lambda_x^(2)-8xy+y^(2)=0` are equally inclined, then

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Sum of values of lambda for which pair of lines x^(2)+2 lambda xy+2y^(2)=0 and (1+lambda)x^(2)-8xy+y^(2)=0 are equally inclined to each other is