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If (l(1),m(1),n1),(l(2),m(2),n(2)) are d...

If `(l_(1),m_(1),n_1),(l_(2),m_(2),n_(2))` are d.c.s of two intersecting lines, show that d.c.s of two lines bisecting the angles between them are proportional to `l_(1)+l_(2),m_(1)+m_(2),n_(1)+n_(2).`

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