x^2+y^2-e^(arctan（y/x）)=0
2x+2y*y'-(arctan（y/x）)'e^(arctan（y/x）)=0
2x+2y*y'-1/(1+y^2/x^2)*(y'x-y)/x^2 *e^(arctan（y/x）)=0
2x+2y*y'-(y'x-y)/(x^2+y^2)*e^(arctan（y/x）)=0
2x+2y*y'-y'x/(x^2+y^2)*e^(arctan（y/x）)+y/(x^2+y^2)*e^(arctan（y/x）)=0
y'=(2x++y/(x^2+y^2)*e^(arctan（y/x）))/(x/(x^2+y^2)*e^(arctan（y/x）)-2y)
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