Question: Prove for vectors u and v that |u x v| 2 = |u|2|v| 2 (u v) 2 Proceed as in the proof of

Prove for vectors u and v that 

|u x v|2 = |u|2|v|2 – (u • v)2

Proceed as in the proof of property (4), computing first the left side and then the right side.

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