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यदि किसी त्रिभुज ABC के शीर्ष A, B, C ...

यदि किसी त्रिभुज ABC के शीर्ष A, B, C क्रमशः `(1, 2, 3), (-1, 0, 0), (0, 1, 2)` है तो `angle ABC ` ज्ञात कीजिए | [ ` angle ABC`, सदिशों `vec(BA)` एवं `vec(BC)` के बीच का कोण है ]

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If the vertices A,B, C of a triangle ABC are (1,2,3),(-1, 0,0), (0, 1,2), respectively, then find angle ABC .

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