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सिद्ध कीजिए कि सदिशों 2hati + 3hatj + h...

सिद्ध कीजिए कि सदिशों `2hati + 3hatj + hatk " व्" 4hati - 4hatj - 7hatk` के मध्य कोण की ज्या (sin) `(1853)/(63)` होगी |

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