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यदि समांतर चतुर्भुज की संलग्न भुजाओं के ...

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

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