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1(3i+4j-5kV50If à = B - C, then determine the angle betweenand B.Hint :Č= B - Å, č. Č= (B - Ả• (B - ÅA? + B2 - 02Ans. 0 = cos2 AB-1If à = 3î + 2ị and B =î -2į + 3 k, then find thmagnitudes of A + B and A - B. Ans. 5, 129Thesum andand difference of two​

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