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यदि `vecA = vecB -vecC`, तो `vecA` व `vecB` के बीच कोण ज्ञात कीजिए |

Answer» Correct Answer - `theta = cos^(-1)((A^(2) + B^(2) -C^(2))/(2 AB)).`
`vecC = vecB - vecA, vecC * vecC = (vecB - vecA) * (vecB - vecA).`


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