Hello!
In the picture below, i can't seem to understand how they get from the first line, to the second line.
(https://imgur.com/a/Fal3T)
When i write it up as dr/dT on the leftside, and separate the r's and the T's, i get dr/((1/2)*r-(1/16)*r^5)=dT which is not the same as in the...