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If the projection of vector $x$ onto vector $y$ is $y$, and projection of $y$ onto $x$ is $\frac12 x$, what is the angle between $x$ and $y$?

I calculated the angle between them to be $45^{\circ}$, and would like this answer to be verified.

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    Well, how did you get this answer? (It's correct, by the way.)2011-10-18

3 Answers 3