Даны точки А(1;-2;2), В(1;4;0), С(-4;1;1) и D(-5;-5;3).
Найдите угол между векторами АС и BD.


a)45 градусов; б)90 градусов; в)30 градусов; г) arccos 2/3; д)60 градусов

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