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vecA and vecB are vectors such that...

vecA and vecB are vectors such that A +BI= I A -B j. Then, the angle between them is

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`| vecA + vecB|=| vecA- vecB|implies A^2 +B^2 +2AB cos theta = A^2 +B^2 -2AB cos theta `
` implies 4AB cos theta theta =0 implies cos theta =0implies theta =pi/2`
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