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[" 1.If the lines "x=ay+b,z=cy+d" and "x...

[" 1.If the lines "x=ay+b,z=cy+d" and "x=a'z+b',],[y=c'z+d'" are perpendicular,then "],[[" (a) "cc'+a+a'=0," (b) "aa'+c+c'=0],[" (c) "ab'+bc'+1=0," (d) "bb'+cc'+1=0]]

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