2 public questions tagged with this topic.
Understanding this is easy: complete solution: write formula, plug data, do arithmetic. Final value matches The determinant is equal to 0. Simple and accurate.
Ref: NCERT Mathematics Class XII — Matrices and Determinants
Think of it like this: using formula we get a/b is one of the cube roots of -1.. Calculation gives this directly, check steps: apply rule, substitute values, simplify to get a/b is one of the cube roots of -1..
Ref: NCERT Mathematics Class XI and XII
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