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[" 58.If "u=x^(2)+y^(2)" and "x=s+3t,y=2...

[" 58.If "u=x^(2)+y^(2)" and "x=s+3t,y=2s-4" ,then "(d^(2)u)/(ds^(2))" is "],[[" a."12," b."32],[" c."36," d."10]]

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