y=y(x)由ln(x^2+y^2)=2arctan(y/x)决定,求d2y/dx2

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y=y(x)由ln(x^2+y^2)=2arctan(y/x)决定,求d2y/dx2
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y=y(x)由ln(x^2+y^2)=2arctan(y/x)决定,求d2y/dx2
y=y(x)由ln(x^2+y^2)=2arctan(y/x)决定,求d2y/dx2

y=y(x)由ln(x^2+y^2)=2arctan(y/x)决定,求d2y/dx2