dy/dt=((2t)'(t+1)-(2t)(t+1)')/(t+1)^2=(2(t+1)-2t)/(t+1)^2=2/(t+1)^2
dx/dt=((t^2-2)'(t+1)-(t^2-2)(t+1)')/(t+1)^2=(2t(t+1)-(t^2-2))/(t+1)^2=(t^2+2t+2)/(t+1)^2
所以dy/dx=(dy/dt)/(dx/dt)=2/(t^2+2t+2)
x=(t^2-2)\(t+1) y=(2t)\(t+1) 求dy\dx
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