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If vecA and vecB are two non-zero vecto...

If `vecA` and `vecB` are two non-zero vectors such that `|vecA+vecB|=|vecA-vecB|/2` and `|vecA|=2|vec B|` then the angle between `vecA` and `vecB` is `theta` such that `cos theta=-m/n` (where m and n are positive integers and `m/n` lowest form) then find `m + n`

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