How can I do that? I didn't know there was a relationship between those 2?
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Ben Grossmann
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user3015986
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The top answer uses the law of cosines. – Sep 02 '15 at 04:01
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It is worth mentioning that this is how "angles" are defined in non-euclidean settings, such as the "angle" between the sequence $(1,\frac{1}{2},\frac{1}{4},\frac{1}{8},\dots)$ and the sequence $(1,0,\frac{1}{3},0,\frac{1}{9},0,\dots)$ in $l_2$. – JMoravitz Sep 02 '15 at 04:10
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Thanks guys, but how can I do the same for ||u x v|| = ||u|| ||v|| sinθ ? – user3015986 Sep 02 '15 at 04:29
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@user3015986 for one, you can make a new post. In short, though, it comes down to using what we know about dot products. – Ben Grossmann Sep 02 '15 at 04:41