$\partial _ A(aa', b) = \partial _ A(a, b)\partial _ A(a', b)$ and $\partial _ A(a, bb') = \partial _ A(a, b)\partial _ A(a, b')$ for $a, a', b, b' \in A$ nonzerodivisors,
$\partial _ A(aa', b) = \partial _ A(a, b)\partial _ A(a', b)$ and $\partial _ A(a, bb') = \partial _ A(a, b)\partial _ A(a, b')$ for $a, a', b, b' \in A$ nonzerodivisors,
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