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Math Help - Unit Circles

  1. #1
    Junior Member
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    Unit Circles

    I have a couple questions when it comes to this, but it say to find the
    cos ( -270 ).

    I think the coordinates are ( 0, 1 ) idk what to do after this.

    ...Help? Please?
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  2. #2
    Super Member
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    Find a coterminal for -270 between 0 and 360.

    -270 + 360 = 90

    From the unit circle, \cos{90} is 0, because, as you said, the coordinates are (0,1). The points are in this form:

    P(\cos\theta, \sin\theta)
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  3. #3
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    wouldnt it just be zero then? cuz cos is focused on the x...and its ( 0, 1 )
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  4. #4
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    Quote Originally Posted by Chop Suey View Post
    From the unit circle, \cos{90} is 0
    ..
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  5. #5
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    oh im sorry i read what you wrote wrong. lol sorry!
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