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यदि bar(a),bar(b) और bar(c) कोई सदिश हो...

यदि `bar(a),bar(b)` और `bar(c)` कोई सदिश हों, तो सिद्ध कीजिए कि
`bar(a)xx(bar(b)+bar(c))+bar(b)xx(bar(c)+bar(a))+bar(c)xx(bar(a)+bar(b))=bar(0)`.

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