(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

F = 1/2.a(T-Tc)M^2 + 1/4.bM^4

I need to find dF/dM

a,Tc,b are positive constants

2. The attempt at a solution

I assume this is to do with partial derivatives etc.

So I found:

∂F/∂T = 1/2.aM^2

∂F/∂M = TaM - TcaM + bM^3

And using a chain rule:

dF/dM = ∂F/∂T.dT/dM + ∂F/∂M.dM/dM

But not sure how to find dT/dM

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# Homework Help: Multi-variable differential question

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