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एक समान्तर चतुर्भुज का क्षेत्रफल ज्ञा...

एक समान्तर चतुर्भुज का क्षेत्रफल ज्ञात कीजिए जिसकी संलग्न भुजाएँ सदिश `veca = hati - hatj + 3hatk ` और द्` vecb = 2hati - 7hatj + hatk ` द्वारा निर्धारित हैं |

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