Determinant orders 2 and 3 (2×2: ad−bc; 3×3: expansion along a row/column with cofactors.)

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2×2: ad−bc; 3×3: expansion along a row/column with cofactors.

What each symbol means

SymbolWhat it stands for
a,b,c,dEntries of 2×2

When to use this

Determinant defined for square matrices only.