# Second Order OPAMP circuit

I was trying to understand the way this problem was solved and I got confused with the latter part of the solution. I encircled the part that confused me. They seem to contradict each other. If $$\dfrac{\text{d}v(0+)}{\text{d}t} = 0$$ why is it $$\dfrac{\text{d}v(0+)}{\text{d}t} = -1$$ in the other one? Please explain.

• That's a typo, the first encircled equation is supposed to be $\frac{dv_1}{dt}$. – Sam Farjamirad Apr 16 at 11:52