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दो सदिश veca और vecb इस प्रकार हैं कि |...

दो सदिश `veca` और `vecb` इस प्रकार हैं कि `|veca|=1, |vecb|=2` तथा `veca.vecb=0`, तो सदिशों `veca` और के बीच का कोण ज्ञात कीजिए ।

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