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Thread: The Cosine Curve

  1. #1
    New Member
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    Apr 2012
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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!

  2. #2
    Elite Member mmm4444bot's Avatar
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    Oct 2005
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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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