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veca xx vecb = ?...

`veca xx vecb = ?`

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If veca and vecb are unequal unit vectors such that (veca - vecb) xx[ (vecb + veca) xx (2 veca + vecb)] = veca+vecb then angle theta " between " veca and vecb is

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For any vectors veca and vecb, (veca xx hati) + (vecb xx hati) + ( veca xx hatj) . (vecb xx hatj) + (veca xx hatk ) .(vecb xx hatk) is always equal to