I'm doing Tenenbaum's ODE page 91, problem 16, can't see what's going on. We have I want to find an integrating factor by finding one of the forms in which I can divide the difference of these, , by (or there are formulae if this is off by a factor of ). Or I want to divide times a factor of or .

But (grrrrr! so close! )

And only factors into an and something bad.

So... I got nothing.