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Two non zero vectors vecA "and" vecB are...

Two non zero vectors `vecA "and" vecB` are such that `|vecA+vecB|=|vecA - vecB|`. Find angle between `vecA "and " vecB`?

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`|vecA+vecB|=|vecA-vecB| rArr A^(2)+B^(2) +2ABcos theta=A^(2)+B^(2)-2AB cos theta`
`rArr 4AB cos theta=0 rArr cos theta =0rArr theta=pi/2`
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