In Problems 46–49, find the dot product v . w and the angle between v and w.46. v = - 2i + j, w = 4i - 3j 47. v = i - 3j, w = - i + j 48. v = i + j + k, w = i - j + k 49. v = 4i - j + 2k, w = i - 2j - 3k

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