I was looking at the thread where this person list the methods for differential equations. In the exact equation part, he appears to integrate ln(y) with respect to x and obtain xln(y). How do you do this?
Since it is being integrated w.r.t. $\displaystyle \displaystyle x$, $\displaystyle \displaystyle \ln{y}$ is treated as a constant.
What's the integral of a constant?
x multiplied by the constant. ahh thanks very much. On a side note, when you differentiate say xy, you do not treat y as a constant. You get y+x(dy/dx). Is that because your treating y as a function of x?