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उस त्रिभुज का क्षेत्रफल ज्ञात करें जिसके...

उस त्रिभुज का क्षेत्रफल ज्ञात करें जिसके शीर्षों के स्थिति सदिश `hati+hatj+2hatk,2hati+2hatj=3hatk` तथा `3hati-hatj-hatk` हैं |

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