Finding the derivative of y= x / e^x + 1

[jself]

The problem is y= x / e^x + 1

= (e^x + 1)(x) - (x) (e^x) / (e^x + 1)^2
=(xe^x +x) -(xe^x)/ (e^x+1)^2
x/(e^x +1)^2

I am not sure if I am working it out correctly. Please help me figure out what I am doing wrong.

 

[tkhunny]

Re: Finding the derivative

(e^x + 1)(x) - (x) (e^x) / (e^x + 1)^2

Whoops! It should be: (e^x + 1)(1) - (x) (e^x) / (e^x + 1)^2