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[" 57.The centre and the radius of the s...

[" 57.The centre and the radius of the sphere "],[2x^(2)+2y^(2)+2z^(2)-2x+4y+2z+1=0" are respectively "],[" (a) "(1,-2,-1),sqrt(6)],[(b)(2,-1,-1),sqrt(6)],[(c)(-1,2,-2),3],[" (d) "((1)/(2),-1,-(1)/(2)),1]

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