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I need a simple way to turn a vector by an angle. I know that it works with rotation matrix but i dont know how to use it. Can u give me a simple formular?

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    http://en.wikipedia.org/wiki/Rotation_matrix I think it explains a lot, if you work on Cartesian coordinates.2011-07-18

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In addition to the links above, here is how to perform matrix multiplication. Please keep us updated of your progress and any questions that you get after you have attempted the problem.

Also, please add the [homework] tag to all homework questions.

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    @Theo: I try to put in as much effort into my answers as the OP puts into the question, except that I round up to grammatical correctness if necessary. Do you think I should delete and comment out?2011-07-18