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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 to ` vec b- vec c ,` where ` vec a!= vec d` and ` vec b!= vec c`

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