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Let veca and vecb be two vectors of the ...

Let `veca` and `vecb` be two vectors of the same magnitude such that the angle between them is `60^(@)C` and `veca.vecb`=8. Find `|veca|` and `|vecb|`.

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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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