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Prove that for any vector A and B the following is true
llAxBll^2 +lA·Bl^2 =llAll^2 llBll^2
5 years ago

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Answered by oobleck
A×B = |A|*|B|*sinθ
A•B = |A|*|B|*cosθ
now, what is your most basic trig identity?
5 years ago
Answered by Reiny
vector identity :
|A×B| = |A|*|B|*sinθ
5 years ago
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Prove that for any vector A and B the following is true
llAxBll^2 +lA·Bl^2 =llAll^2 llBll^2

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