Here's the question you clicked on:
TomLikesPhysics
I need help with a differential equation.
Here is the problem - until yet I never encountered a problem like this.
I am not sure http://www.wolframalpha.com/input/?i=y%27+%3D+1+-+y^2
I think I made a mistake just at the beginning...
I am not sure about this method!! I don't remember doing it!!
well ... that solves it. :)