Could you please teach me how to solve this question? I don't know how to do it at all. Thank you very much.

Question:

Prove: If a , b, c, and d lie in the same plane when positioned with a common initial point then (a*b) * (c *d) =0.

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- January 2nd 2007, 01:11 PM #1

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- January 2nd 2007, 01:19 PM #2

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