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यदि समांतर चतुर्भुज की संलग्न भुजाओं के ...

यदि समांतर चतुर्भुज की संलग्न भुजाओं के परिमाण `2hati-3hatj+hatk` और `4hati+hatj-3hatk` दिशा में सदिश और हो, तो उसका क्षेत्रफल ज्ञात कीजिए ।

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

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