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If A(3, 4, 5), B(4, 6, 3), C(-1, 2, 4) a...

If A(3, 4, 5), B(4, 6, 3), C(-1, 2, 4) and D(1, 0, 5) are such that the angle between the lines `bar(DC) " and "bar(AB) " is " theta " then " costheta=`

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