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    in edexcel chapter 3 books. How would i know whether to use cos or sin in order to find time in circular motion/
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    (Original post by Dafock)
    in edexcel chapter 3 books. How would i know whether to use cos or sin in order to find time in circular motion/

    Heya, maths questions should be posted in the maths forum, they will get much quicker replies there. I have asked for this thread to be moved there.

    I don't know the answer to your question but there must be some pattern (perhaps it is to do with initial conditions) which determine which function to use, but someone who knows the correct answer will answer

    Good luck!
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