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Answer» first changed all the rows to columns in R.H.S.|l m n| = | n l m||e d f| = | f e d||u v w| = |w u v|now,interchange 1st and 2nd column in R.H.S. |l m n| = | l n m||e d f| = | e f d||u v w| = |u w v| now,interchange 2nd and 3rd column in R.H.S. |l m n| = | l m n||e d f| = | e d f||u v w| = |u v w| so L.H.S. = R.H.S.Hence proved. first changed all the rows to columns in R.H.S.|l m n| = | n l m||e d f| = | f e d||u v w| = |w u v|now,interchange 1st and 2nd column in R.H.S. |l m n| = | l n m||e d f| = | e f d||u v w| = |u w v| now,interchange 2nd and 3rd column in R.H.S. |l m n| = | l m n||e d f| = | e d f||u v w| = |u v w| so L.H.S. = R.H.S.Hence proved. |
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