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If bar(a),bar(b),bar(c),bar(d) are non z...

If `bar(a),bar(b),bar(c),bar(d)` are non zero coplanar vectors and `2x_(1)bar(a)+2x_(2)bar(b)-bar(c)+4x_(3)bar(d)=bar(0),x_(l),x_(2),x_(3)` real then minimum value of `x_(1)^(2)+x_(2)^(2)+x_(3)^(2)` is

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