求x=t×e的t次方与lny+y=t方的参数方程
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x = te^t ==> x' = e^t(t+1) ...... (1), Attn: x' = dx/dt; y' = dy/dt
lny+y= t^2 ==> y'/y+y' = 2t ==> y' = 2ty/(1+y) ......(2)
dy/dx = y'/x' = 2ty/[(1+y)e^t(t+1)]
lny+y= t^2 ==> y'/y+y' = 2t ==> y' = 2ty/(1+y) ......(2)
dy/dx = y'/x' = 2ty/[(1+y)e^t(t+1)]
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