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Math Help - multiple angles

  1. #1
    Member >_<SHY_GUY>_<'s Avatar
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    Question multiple angles

    cos\frac {x}{4} = 0

    What do I do here?
    And how do I know when to use 2n\pi or n\pi
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  2. #2
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    Quote Originally Posted by >_<SHY_GUY>_< View Post
    cos\frac {x}{4} = 0

    What do I do here?
    And how do I know when to use 2n\pi or n\pi
    you should know where \cos(u) = 0 from your knowledge of the unit circle ...

    \frac{x}{4} = \frac{\pi}{2} \, , \, \frac{3\pi}{2} \, , \, \frac{5\pi}{2} \, , \, ...
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