1. The problem statement, all variables and given/known data y''+(y')2 = y, y(0)=1, y'(0)=1/√2 2. Relevant equations Bernoulli's method. 3. The attempt at a solution Using the substitution p=y' I get this: p'p + p2 = y, so I can use z=p2 to solve this. However, I'm getting something wrong. I think it could be because I'm having too much letters - p, z, y, x so I might be missing some chain rules.