第七题求教
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x=e^t.sint
dx/dt = (sint + cost ).e^t
y=e^t.cost
dy/dt = (cost- sint) e^t
dy/dx
= (dy/dt)/(dx/dt)
= (cost- sint) e^t /[(sint + cost ).e^t]
= (cost- sint) /(sint + cost)
dx/dt = (sint + cost ).e^t
y=e^t.cost
dy/dt = (cost- sint) e^t
dy/dx
= (dy/dt)/(dx/dt)
= (cost- sint) e^t /[(sint + cost ).e^t]
= (cost- sint) /(sint + cost)
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