(1+y^2)dx-(1+x^2)dy=0的通解

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(1+y^2)dx-(1+x^2)dy=0的通解
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(1+y^2)dx-(1+x^2)dy=0的通解
(1+y^2)dx-(1+x^2)dy=0的通解

(1+y^2)dx-(1+x^2)dy=0的通解
(1+y^2)dx-(1+x^2)dy=0
(1+y^2)dx=(1+x^2)dy
dx/(1+x^2)=dy/(1+y^2)
两边积分
arctanx=arctany+C

(1+y^2)dx-(1+x^2)dy=0
(1+y^2)dx=(1+x^2)dy
1/(1+x^2)dx=1/(1+y^2)dy
arctanx=arctany+c