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सिद्ध कीजिए कि सदिश vecA=2hati-3hatj+7ha...

सिद्ध कीजिए कि सदिश `vecA=2hati-3hatj+7hatk` तथा `vecB=-4hati+6hatj-14hatk` परस्पर समांतर हैं।

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