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[" ark "],[" 6.If "x^(2)+y^(2)+z^(2)!=0,...

[" ark "],[" 6.If "x^(2)+y^(2)+z^(2)!=0,x=cy+bz,y=az+cx" and "z=bx+ay" then "a^(2)+b^(2)+c^(2)+2abc=],[" Marks "(+4)(-1)],[" single choice "],[[" (A) 0"]],[" (в) "],[" (C) "2],[" (D) "-1]

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