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y=dsolve('r*(Dy)^2/(1+(Dy)^2)^0.5+y*0*Dy+r*0*Dy/(1+(Dy)^2)^0.5-y=0','x')
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y=dsolve('Dy=sqrt((y^2/r^2+sqrt(y^4/r^4+4*y^2/r^2))/2)','x')
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int((2^(1/2)*r)/(r^2*((4*r^2*y^2 + y^4)/r^4)^(1/2) + y^2)^(1/2), y, IgnoreAnalyticConstraints) - x - C64 == 0
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