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lamda के वे मान ज्ञात कीजिए जिनके लिए सद...

`lamda` के वे मान ज्ञात कीजिए जिनके लिए सदिशों `bara=2lamda^(2)hati+4lamdahatj+hatk` और `barb=7hati-2hatj+lamdahatk` के बीच का कोण अधिक कोण है ।

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