[" 9) One of the line represented by the...

[" 9) One of the line represented by the equation "],[ax^(2)+bxy+cy^(2)=0" bisects an angle between the "],[" co-ordinate axes if "],[[" a) "a,b,c" are in A.P."," b) "a,b,c" are in G.P."],[" c) "a,b,c" are in H.P."," d) "a+b+c=0]]

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