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If l1,m1,n1 ; l2,m2,n2 be the direction cosines of two concurrent lines, then direction cosines of the line bisecting the angles between them are proportional to ? |
| Answer» If l1,m1,n1 ; l2,m2,n2 be the direction cosines of two concurrent lines, then direction cosines of the line bisecting the angles between them are proportional to ? | |