Calculus 3: how to find all second partial derivatives

[@DiabloTheKingOfHell]

I had partial derivatives come up in my Physics 2 class when we were never taught anything like this in calculus 1 or 2. Turns out, it was a calculus 3 thing. Thanks a ton for this tutorial, you're a lifesaver.

[@mariamoon7760]

I was searching for u, thank uuuu

[@neilgerace355]

2:02 By whose theorem, please? I didn't catch that.

[@bprpcalculusbasics]

Clairaut's theorem

[@neilgerace355]

@@bprpcalculusbasics Thank you!

[@ImageLimestone]

I fall asleep to this, thank you

[@yaseenelhosseiny]

I think you just partially differentiate the first partial derivative

[@k0pstl939]

Yeah

[@PHYSICSGUY-x2l]

Anyone tell me that is there any formula for ln(x+y) ??? I don't find anywhere..

[@s1d900]

It's 2 /x+y