[" 20) The ends of a rod of length " "l" " move on two mutually perpendicular lines.The locus of the point on "],[" the rod which divides it in the ratio "1:2" is "],[[" 1) "9x^(2)+34y^(2)=2l^(2)," 2) "9x^(2)-34y^(2)=l^(2)," 3) "9x^(2)+36y^(2)=4l^(2)" 4) "9x^(2)-36y^(2)=4l^(2)]]