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posted by Hannah on Wednesday, March 31, 2010 at 5:34pm.
Use the law of cosines to find the angle Q between the given vectors. v = 3i + j w = 2i - j
v•w = |v| |w|cos Ø v•w = 6 - 1 = 5 5 = √10√5cosØ cosØ = 5/√50 Ø = 45°
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