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For what angle between A and B, `|A+B| = | A-B` .

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For what angle between A and B, `|A+B| = | A-B` .
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`R rArr S = sqrt(A^2 + B^2 + 2AB cos theta)`
`= sqrt(A^2 + B^2 - 2AB cos theta)`
Solving we get, `cos theta = 0` or `theta = 90^@`
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