Partial Derivatives: Finding fy for (e^0.16)/(1+e^-0.3y)

[MathNoob123]

Homework Statement

(e^0.16)/(1+e^-0.3y)
I am suppose to find the f_y
of this

Homework Equations

A bit trickier than the last prob i posted

The Attempt at a Solution

What I did:
Since (e^0.16) is a constant, I left it just like that and took the derivative of e(-0.3y)

my outcome: (e^-0.16)/(-0.3e^-0.3y)

 

[phreak]

You can't just take the derivative of the bottom and leave it like that. That's equivalent to saying that the derivative of 1/f is 1/f', which is false. First of all, find the derivative of 1/x. Now use substitution and the chain rule.