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Thread: The Cosine Curve

  1. #1
    New Member
    Join Date
    Apr 2012

    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
    Join Date
    Oct 2005
    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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