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[" If the position vectors of "A,B" and "C" are respectively "2hat imath-j+widehat k,hat i-3hat j-5widehat k" ,"],[" and "3hat imath-4hat j-4hat k," then "cos^(2)A=],[[" a) "0," b) "6/41," c) "35/41," d) "1]]

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