1.

If bar(a),bar(b),bar( c ) and bar(d) are coplanar vectors then (bar(a)xx bar(b))xx(bar( c )xx bar(d))= …………..

Answer»

`|BAR(a)XX bar( C )|^(2)`
`(bar(a)xxbar(a))^(2)`
`|bar(B)xx bar( c )|^(2)`
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