ok....
had a similar problem to the person who asked this question....
Slidey posted:
y''=168e^4x(e^2x+1)^5 + 28e^2x(e^2x+1)^6
y''=28e^2x(e^2x+1)^5(6e^2x+e^2x+1)
y''=28e^2x(e^2x+1)^5(7e^2x+1)
I was able to get the first part to this response by my self...but for some odd reason i...