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- Hello there, I need to get the Taylor Series for f(r) and r is a function f(x,y,z))=r

I have taken a look but most books and Online stuff just menctions the First order Taylor for 3 variables or the 2nd order Taylor series for just 2 variables.

Could you please tell me which is the general expression for 2nd order Taylor series in 3 or more variables? Because I have not found nothing at all.

Thanks

Could you please tell me which is the general expression for 2nd order Taylor series in 3 or more variables? Because I have not found nothing at all.

Thanks