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सिद्ध कीजिए कि वह त्रिभुज जिसके शीर्षो...

सिद्ध कीजिए कि वह त्रिभुज जिसके शीर्षों के स्थिति सदिश क्रमश : `2 hati - hatj + hatk , hati - 3 hatj - 5 hatk, 3hati - 4 hatj - 4 hatk` है , एक समकोण त्रिभुज है ।

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यदि A (-hati + 3hatj + 2hatk) , B (-4hati + 2hatj - 2hatk) तथा C(5hati + (lambda +1)hatj + mu hatk) संरेखीय है तब :