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If bar(a) , bar(b) are non-zero vectors...

If `bar(a) , bar(b) ` are non-zero vectors such that `|bar(a)+bar(b)|^2 = |bar(a)|^(2)+ |bar(b)|^(2)`, then find the angle between `bar(a) , bar(b)`.

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The correct Answer is:
`90^(@)`
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