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यदि bar(a),bar(b),bar(c ) ऐसे मात्रक सदि...

यदि `bar(a),bar(b),bar(c )` ऐसे मात्रक सदिश है कि कि `bar(a) + bar(b) +bar(c)= bar(0) `तो सिद्ध कीजिये कि `bar(a),bar(b) + bar(b) .bar(c )+bar(c ) . bar(a) = -3 //2 `

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