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

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SUMMARY

The discussion focuses on finding the partial derivative fy of the function (e^0.16)/(1+e^-0.3y). The participant correctly identifies e^0.16 as a constant and attempts to differentiate e^-0.3y. However, they mistakenly apply the derivative rules, leading to an incorrect outcome. The correct approach involves using the quotient rule and the chain rule to differentiate the function accurately.

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  • Knowledge of the chain rule for differentiation
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MathNoob123
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Homework Statement


(e^0.16)/(1+e^-0.3y)
I am suppose to find the fy
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)
 
Physics news on Phys.org
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.
 

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