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Given that vec A + vec B= vec R and A^(...

Given that ` vec A + vec B= vec R and A^(20 + B^(2) -R^(2)`, find the angle between ` vec A and vec B` .

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` cos theta = (R^2 -A^2 -B^2)/(2 AB) = (R^2 -R^2)/(2 AB) =0`
or ` theta = 90^@`.
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