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If bar(a)bar(b)bar(c ) and bar(d) are ve...

If `bar(a)bar(b)bar(c ) and bar(d)` are vectors such that `bar(a) xx bar(b) = bar(c ) xx bar(d) and bar(a) xx bar(c ) = bar(b)xxbar(d)`. Then show that the vectors `bar(a) - bar(d)` and `bar(b) -bar(c )` are parallel.

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