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Math Help - Sat Practice Help

  1. #1
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    Sat Practice Help

    Hello! I bought an SAT practice book to get ready for the big test. It is pretty well formated, except it only has the answers/explanations to random questions. I was just hoping that you guys could help me with a question here or there that I didn't know how to solve. Thanks!


    Find the set of all real x where 0 < x < 2pi, such that cos(2x) > 0
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  2. #2
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    Quote Originally Posted by Mr_Green View Post
    Find the set of all real x where 0 < x < 2pi, such that cos(2x) > 0
    I hope you know how the cosine curve looks like, (see below), you are expected to graph it by hand.

    In that case the answer is simple.
    Graph y=\cos 2x an observe.

    To get,
    0<x<\pi /4
    3\pi/4<x<5\pi/4
    7\pi/4<x<2\pi
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  3. #3
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    .....

    Ok. thanks! I understand what the questions wanted know!
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