4 5 decimal
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changing addends order..

mixed derivatives

wrong

ok

x.2 1 - x.2 + ( * - 0

...results are different!

ok

wrong

 0 x.1 1 - x.1 + ( * -

x.1 derivatives

 3 x.1 2 ^ * 0 x.1 x.1 x.2 - ( * x.2 2 ^ + x.1 x.2 + ( 2 x.1 * x.2 - ( * +

not simplified but correct, although...

develop the equation and then evalutate:

 3 x.1 2 ^ *

direct evalutation:

 x.1 x.1 x.2 - ( * x.2 2 ^ + x.1 x.2 + ( x.2 - 2 x.1 * + ( * +

x.2 derivatives

 0 3 x.2 2 ^ * x.1 x.1 x.2 - ( * x.2 2 ^ + x.1 x.2 + ( x.1 - 2 x.2 * + ( * +

not simplified but correct (like above)

develop the equation and then evalutate:

 3 x.2 2 ^ *

direct evalutation:

 x.1 x.1 x.2 - ( * x.2 2 ^ + x.1 x.2 + ( x.1 - 2 x.2 * + ( * +

mixed derivatives from previous results

 0 0

ok, like:

 x.2 1 - x.2 + ( * -

wrong, like:

 x.2 1 - x.2 + ( * -

addends derivatives

 2 x.1 * x.2 - 0 2 x.1 x.2 - ( * x.2 + ( - x.2 2 x.1 * -

<->

 0

ok...why???

 2 x.1 * x.2 -

ok (1st and 2nd addends of 1st derivative)

 2 x.1 x.2 - ( * x.2 + ( -

ok (2nd and 3rd addends of 1st derivative)

 x.2 1 - x.2 + ( * -

wrong (1st and 3rd addends of 1st derivative), but developing the argument the result is right

0