Partial derivatives of multivariable functions__(showing_3)

in this tutorial we look at Partial derivatives of multivariable functions

[@longolongogoodson1285]

That's with respect to y

[@longolongogoodson1285]

On the second derivative we had u=2x but how did u' become zero what rule did you apply there sir

[@TranscendedEngineering]

we were partially differentiating wrt y