討論串[理工] [工數]ODE解不出來
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使用 Exact ODE Method. 原式: cosy dx + [-2xsiny+2ysiny-cosy] dy = 0. M(x,y) = cosy. N(x,y) = -2xsiny+2ysiny-cosy. dM dN. --- = -siny ; --- = -2siny. dy dx
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內容預覽:
原式= cosydx-2xsinydy+2ysinydy-cosydy=0. dx-2xtanydy = dy-2ytanydy. I=exp(2lncosy)=(cosy)^2. => d((cosy)^2x)=(cosy)^2dy-2ysinycosydy. =(cosy)^2dy+yd((co
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