[理工] 一階ODE
(x + 2x^2y^2)dy + (4x^2y + xy^3 - y)dx = 0
用grouping
最後是 d(lny/x) + d(xy^2) +4xdx = 0
兩邊積分是lny/x + xy^2 +2x^2 = c
還是ln|y/x| + xy^2 +2x^2 = c ??????????????????????????
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