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You have differentiated with respect to x or y?

Well, fyx. So I first diff with respect to y then with respect to x. :)

it's the mixed derivative?
let me check...

Ok :)

Fy first. :) Then diff Fy with respect to x.

oh but I have a 16...

I'll do it the other way on paper to see if that makes a diff

ok I redid it the other way and got the same answer as you
sorry for the confusion

no it's my fault for messing up the first time
you're welcome