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For any vector bar(a) show that |bar(a) ...

For any vector `bar(a)` show that `|bar(a) xx bar(i)|^(2) + |bar(a) xx bar(j)|^(2) + |bar(a) xx bar(k)|^(2)= 2|bar(a)|^(2)`

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The correct Answer is:
`2|a|^(2)`
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-PRODUCT OF VECTORS-SOLVED PROBLEMS
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