1.

For three vectors bar(a),bar(b) and bar( c ),bar(a)xx(bar(b)xx bar( c ))=(bar(a)xx bar(b))xx bar( c ) then

Answer»

`BAR(b)XX(bar(a)xx bar( C ))=0`
`bar(a)(bar(b)xx bar( c ))=0`
`bar( c )xxbar(a)=bar(a)xx bar(b)`
`bar( c )xxbar(b)=bar(b)xx bar(a)`

Answer :A


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