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Thread: The Cosine Curve

  1. 04-28-2012, 12:50 PM #1
    Xine
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    The Cosine Curve

    Hi there I would like to know how to do the following questions without drawing a graph. What is the formula?

    The question: Express each of the following in terms of the cosine of another angle between 0° and 180°

    a) cos 20°
    b) cos 85°

    Thank you for any help!
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  2. 04-28-2012, 04:26 PM #2
    mmm4444bot
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    Quote Originally Posted by Xine View Post

    What is the formula?

    There is no formula.

    Treat the given angles as reference angles or use the symmetry of a unit circle.

    If you have not been taught either of these concepts, let us know.

    Cheers ~ Mark
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