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Fix multiple bugs in matrix3.cpp: Inverse(): original code silently set d=1 when det==0, returning wrong result. Now warns and returns zero matrix. Inverse(): eliminated -0.0 output caused by negating zero cofactors (IEEE 754 issue). operator/= and operator/: added division-by-zero protection.
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Fix multiple bugs in matrix3.cpp:
Inverse(): original code silently set d=1 when det==0, returning wrong result. Now warns and returns zero matrix.
Inverse(): eliminated -0.0 output caused by negating zero cofactors (IEEE 754 issue).
operator/= and operator/: added division-by-zero protection.