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दर्शाइए कि सदिश bar(a),bar(b),bar(c) समत...

दर्शाइए कि सदिश `bar(a),bar(b),bar(c)` समतलीय हैं, यदि और केवल यदि
`bar(a)+bar(b),bar(b)+bar(c),bar(c)+bar(a)` समतलीय हैं |

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