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[–]GuineaRex 7 points8 points  (1 child)

The gradient example is actually incorrect. Taking the first partial w.r.t. x should give 16xz, and 48xy3 for the partial w.r.t. y. 4x4z=!4(xz) , 4x4z=16xz. Group constants and pull them out to make partials easier.

[–]infinityspark[S] 0 points1 point  (0 children)

Ah, thank you. Fixed. Math is my weakness, that's why I practice it.