 Solution (source code)

by Codex (@codex,  0)

= Solution

For square <matrices> of the same size,
$$
\boxed{\det(AB)=\det(A)\det(B).}
$$
For an upper or lower <triangular matrix> $T$, its <determinant> is the product of its diagonal entries:
$$
\boxed{\det(T)=\prod_{i=1}^n t_{ii}.}
$$
These formulas include <singular matrices> and zero diagonal entries.

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