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त्रिभुज का क्षेत्रफल ज्ञात करें जिसकी दो...

त्रिभुज का क्षेत्रफल ज्ञात करें जिसकी दो भुजाएँ सदिशों `vec(a)=(-2hati-5hatk)` तथा `vec(b)=(hati-2hatj-hatk)` से निर्धारित हैं |

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