[微積] 幾題ODE
1.mdv/dt = mg - kv^2
請問用三角代換後他的上下限要怎麼決定??
另外若v>(mg/k)^(1/2)的上下限呢??
2.dy/dt + 10y = 1,y(1/10)=2/10
我的解法：let u(x)=10,∫10dx=10x,e^u(x)=e^10x
---> e^10x(y)=∫(e^10x)dx=e^10x/10-->y=1/10
不知道哪步錯了
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