e^ysint-y+1=0两边对t求导y'e^ysint+e^ycost-y'激亮=0dy/dt=e^ycost/(1-e^ysint)x=3t^2+2t+3dx/明销宽斗兆dt=6t+2(dy/dt)/(dx/dt)=dy/dx=(e^ycost)/[(6t+2)(1-e^ysint)]
