Question: PLEASE NOTE : I need Q80 only In Exercises 79 and 80, use the Law of Cosines to find the angle a between the vectors.

PLEASE NOTE : I need Q80 only

In Exercises 79 and 80, use the Law of Cosines to find the angle a between the vectors. ( Assume O' S a $ 180'.) 79. v = i + j. w - 21 - 2j 80. = i + 2j. w = 2i - j

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