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posted by Bob Monday, April 29, 2013 at 11:30am.
Let θ be the angle between two vectors v and u . If v*u =12, |v|=2, |u|=6√2 and 0∘<θ<180∘, what is the value of θ (in degrees)?
v•u = |v| |u| cosθ, so cosθ = 12/(2*6√2) = 1/√2 clear now?
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