"y'=\\frac{2y-3x^2}{3y^2-2x},\\;\\;y'(1,1)=-1."
"y''=\\frac{(18xy-6y^2-4x)y'-18xy+4y+6x^2}{(3y^2-2x)^2},\\;\\;y''(1,1)=-16."
Radius of curvature:
"R=|\\frac{1+y'^2)^{\\frac{3}{2}}}{y''}|=\\frac{\\sqrt{2}}{8}."
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