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Thread: Help with Trigonometry-- Cos(-1)

  1. #1
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    Help with Trigonometry-- Cos(-1)

    We have a test tomorrow that he hinted there is a problem we did not go over on. I actually got the answers from a friend because I got impossibly stuck. Our test is on circles but he wanted it to be adding in Soh Cah Toa again a little.

    Help?
    Someone please explain Cos(-1). What does it find?
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  2. #2
    MHF Contributor Mathstud28's Avatar
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    Quote Originally Posted by naturallynatalie View Post
    We have a test tomorrow that he hinted there is a problem we did not go over on. I actually got the answers from a friend because I got impossibly stuck. Our test is on circles but he wanted it to be adding in Soh Cah Toa again a little.

    Help?
    Someone please explain Cos(-1). What does it find?
    It denotes the cosine of the angle if you went one radian clockwise on the cartesian plane opposed to the usual counter clockwise...it is equlivalent to $\displaystyle \cos(2\pi-1)$
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