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|vecA + vecB|^(2) - |vecA - vecB|^(2) = ...

`|vecA + vecB|^(2) - |vecA - vecB|^(2) = n vecA. vecB`
The value of n is :

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Verified by Experts

The correct Answer is:
4
`|vecA + vecB |^(2) - |vecA- vecB|^(2)`
`" "A^(2) + B^(2) + 2vecA. vecB - A^(2)- B^(2) + 2vecA.vecB`
`" "4vecA. vecB`
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