Ответы на вопрос:
Cosb = (ab•bc)/(|ab|•|bc|) ab = (3-1,3-5,2-3) = (2,-2,-1) |ab| = sqrt(4+4+1) = sqrt(9) = 3 bc = (3-3,6-3,5-2) = (0,3,3) |bc| = sqrt(0+9+9) = sqrt(18) = 2sqrt(3) ab*bc = 2*0 + (-2)*3 + (-1)*3 = -6 - 3 = -9
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