If x y z are all different and not equal to zero and | array*20c 1 + x&1&1 1&1 + y&1 1&1&1 + z array | = 0 then the valu
Simply put, we verify -1 by full calculation: use standard identity, substitute, simplify step by step to reach -1.
Ref: NCERT Mathematics Class XII — Matrices and Determinants
