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Manmohan Kaur
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let OA,OB,OC be 3 mutually perpendicular lines through the origin whose direction cosines are<l1,m1,n1>,<l2,m2,n2>,<l3,m3,n3>.if
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let OA,OB,OC be 3 mutually perpendicular lines through the origin whose direction cosines are<l1,m1,n1>,<l2,m2,n2>,<l3,m3,n3>.if
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