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標題:
first order of differential equation
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發問:
solve ydx + (y+ tan(x +y))dy=0
最佳解答:
As follows~~~ 圖片參考:http://i182.photobucket.com/albums/x4/A_Hepburn_1990/A_Hepburn01Dec072302.jpg?t=1197039743 2007-12-12 12:57:12 補充: 小小amendment,tan(x + y) = tanu唔係 u
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