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If vec (a) xx vec(b) = vec (c ) xx vec...

If `vec (a) xx vec(b) = vec (c ) xx vec(d) and vec (a) xx vec ( c) = vec (b) xx vec (d ) , ` show that ` vec(a) - vec (d)` is parallel `vec(b) - vec (c) ` , where to ` vec (a) != vec (d) and vec ( b) != vec (c ) `

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