taylor series multivariable help

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KeypoX

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Aug 31, 2003
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Wiki has it but only up to the second term 1/2!

I need more terms, anyone have a more generic formula i can't find anything.

i think the third term is this 1/3![(x-a)^3fxxx(a,b) + 3 (x-a)(x-a)(y-b)(y-b) +(y-b)^3fyyy(a,b)]

but not sure on that middle term there.
 
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