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Math Help - Question about cos.

  1. #1
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    Question about cos.

    I'm given the question:

    "Explain why cos20 > cos50. Use a diagram in your explanation."

    The 20 and 50 have a degree symbol.

    I don't understand how to explain it. Can anyone help?
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  2. #2
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    Graph the cosine function. Most calculators will use radians. However look at the graph between 0(0 degrees) and pi(180 degrees). You will see that the graph is decreasing. So cos(10)>cos(45)>cos(75)>cos(155) etc. BUT at 180 the graph will begin to increase.
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