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[" 82.If "x^(2)+y^(2)=1" ,then "],[" a) "yy''-2(y')^(2)+1=0],[" b) "yy''+(y')^(2)+1=0],[" c) "yy''+(y')^(2)-1=0],[" d) "yy''+2(y')^(2)+1=0]

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If x^(2)+y^(2)=1 , then a) yy''+(y')^(2)+1=0 b) yy''+2(y')^(2)+1=0 c) yy''-2(y')^(2)+1=0 d) yy''+(y')^(2)-1=0

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