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Math Help - Help with unit circles

  1. #1
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    Help with unit circles

    Hi.
    I am having trouble proving that cos(theta + pi/2) = -sin theta, using a unit circle.
    I was hoping someone could help me out here using a unit circle diagram to show.
    Thanks, Jono
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  2. #2
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    Re: Help with unit circles

    Please.
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  3. #3
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    Re: Help with unit circles

    Quote Originally Posted by jonomono View Post
    Please.
    DO NOT BUMP

    Are you to lazy to do anything for yourself?
    We are not your servants. We do not do your work for you. Why should we?

    YOU have no right to make that demand.

    Now you show some effort on your part, or expect on more help here.
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  4. #4
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    Re: Help with unit circles

    Hi,
    Here's a diagram that helps, I hope.

    Help with unit circles-mhftrig5.png
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