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How to find the lengths of the vectors and the angle between them?

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s=(16;-2;5)\r\n\r\nd=(-12;7;-12)\r\n\r\nc*d=-266\r\n\r\n|c|=16,9\r\n\r\n|d|=18,4\r\n\r\ncos, corner Fi = C*d/|c|*|d|=-0,8553\r\n\r\pugol Fi=149 degrees = 2.6 radians
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